15-x=x+7

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Solution for 15-x=x+7 equation: 



15-x=x+7

We move all terms to the left:

15-x-(x+7)=0

We add all the numbers together, and all the variables

-1x-(x+7)+15=0

We get rid of parentheses

-1x-x-7+15=0

We add all the numbers together, and all the variables

-2x+8=0

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

-2x=-8

x=-8/-2

x=+4

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