SOLUTION: Two times the sum of a number and seven equals negative thirty

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: Two times the sum of a number and seven equals negative thirty       Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


   



Question 1102334: Two times the sum of a number and seven equals negative thirty

Found 4 solutions by josgarithmetic, Lightning_Fast, ikleyn, richwmiller:
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
--------------------------------------------------------------------
two times the sum of a number and seven equals negative thirty
--------------------------------------------------------------------

Let the number be n.


"Sum of a number and seven"
n%2B7


"two times the sum of,..."
2%28whateverSumDescribed%29


"..., equals negative thirty." fixedomission
someDescriptionofExpression=-30

Put everything together exactly as the description was given.

Answer by Lightning_Fast(78) About Me  (Show Source):
You can put this solution on YOUR website!
The following is yielded when converted from English to Math:
2+%2A+%28x+%2B+7%29+=+-30
{{2x + 14 = -30}}}
2x+=+16
x+=+8
The number you are looking for is 8.

Answer by ikleyn(52790) About Me  (Show Source):
You can put this solution on YOUR website!
.
2*(x+7) = -30

2x + 14 = -30

2x = -30 - 14

2x = -44

x = %28-44%29%2F2 = -22.


Answer.  x = -22.

-----------
The solution by @Lightning_Fast is  W R O N G.



Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
Two times the sum of a number and seven equals negative thirty
Lightning fast made an error in arithmetic and
and he forgot that the 30 is negative thirty
2x + 14 = -30
you need to subtract 14 from -30
2x=-30-14
2x=-44

josgarithmetic also forgot that the 30 is negative 30 in his explanation
He says
"..., equals thirty."
He corrected the oversight.