15-x=-8

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Solution for 15-x=-8 equation: 



15-x=-8

We move all terms to the left:

15-x-(-8)=0

We add all the numbers together, and all the variables

-1x+23=0

We move all terms containing x to the left, all other terms to the right

-x=-23

x=-23/-1

x=+23

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