u-9=-7+7

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Solution for u-9=-7+7 equation: 



u-9=-7+7

We move all terms to the left:

u-9-(-7+7)=0

We add all the numbers together, and all the variables

u-9-0=0

We add all the numbers together, and all the variables

u-9=0

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

u=9

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