7=-8+5u

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Solution for 7=-8+5u equation: 



7=-8+5u

We move all terms to the left:

7-(-8+5u)=0

We add all the numbers together, and all the variables

-(5u-8)+7=0

We get rid of parentheses

-5u+8+7=0

We add all the numbers together, and all the variables

-5u+15=0

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

-5u=-15

u=-15/-5

u=+3

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