-7=x+6=15

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Solution for -7=x+6=15 equation: 



-7=x+6=15

We move all terms to the left:

-7-(x+6)=0

We get rid of parentheses

-x-6-7=0

We add all the numbers together, and all the variables

-1x-13=0

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

-x=13

x=13/-1

x=-13

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