-18=7+5u

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Solution for -18=7+5u equation: 



-18=7+5u

We move all terms to the left:

-18-(7+5u)=0

We add all the numbers together, and all the variables

-(5u+7)-18=0

We get rid of parentheses

-5u-7-18=0

We add all the numbers together, and all the variables

-5u-25=0

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

-5u=25

u=25/-5

u=-5

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