15=91+x

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Solution for 15=91+x equation: 



15=91+x

We move all terms to the left:

15-(91+x)=0

We add all the numbers together, and all the variables

-(x+91)+15=0

We get rid of parentheses

-x-91+15=0

We add all the numbers together, and all the variables

-1x-76=0

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

-x=76

x=76/-1

x=-76

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