15+7u=64

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Solution for 15+7u=64 equation: 



15+7u=64

We move all terms to the left:

15+7u-(64)=0

We add all the numbers together, and all the variables

7u-49=0

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

7u=49

u=49/7

u=7

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