15=7+w

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Solution for 15=7+w equation: 



15=7+w

We move all terms to the left:

15-(7+w)=0

We add all the numbers together, and all the variables

-(w+7)+15=0

We get rid of parentheses

-w-7+15=0

We add all the numbers together, and all the variables

-1w+8=0

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

-w=-8

w=-8/-1

w=+8

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