15=7-8u

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Solution for 15=7-8u equation: 



15=7-8u

We move all terms to the left:

15-(7-8u)=0

We add all the numbers together, and all the variables

-(-8u+7)+15=0

We get rid of parentheses

8u-7+15=0

We add all the numbers together, and all the variables

8u+8=0

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

8u=-8

u=-8/8

u=-1

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