SOLUTION: plz help! if the sum of a number and seven is tripled the results is two less than twice the number find the number

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Question 985242: plz help! if the sum of a number and seven is tripled the results is two less than twice the number find the number
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

first, the sum of a number x and 7 is:x%2B7
if the sum of a number x and 7 is tripled, we have: 3%28x%2B7%29=3x%2B21
if the results is 2 less than twice the number, we have:3x%2B21=2x-2
solve for x
3x%2B21=2x-2
3x-2x=-2-21
x=-23
check:
3x%2B21=2x-2
3%28-23%29%2B21=2%28-23%29-2
-69%2B21=-46-2
-48=-48