-2-u=7

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Solution for -2-u=7 equation: 



-2-u=7

We move all terms to the left:

-2-u-(7)=0

We add all the numbers together, and all the variables

-1u-9=0

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

-u=9

u=9/-1

u=-9

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