SOLUTION: When the sum of a number and 10 is doubled the result is the same as 8 minus twice the number. find the unknown number.

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Question 188534: When the sum of a number and 10 is doubled the result is the same as 8 minus twice the number. find the unknown number.
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
let x be the number
:
2(x+10)=8-2x
:
2x+20=8-2x
:
4x=-12
:
x=-3
: