-7u+(-20u)-(-15u)=-12

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Solution for -7u+(-20u)-(-15u)=-12 equation: 



-7u+(-20u)-(-15u)=-12

We move all terms to the left:

-7u+(-20u)-(-15u)-(-12)=0

We add all the numbers together, and all the variables

-7u+(-20u)-(-15u)+12=0

We get rid of parentheses

-7u-20u+15u+12=0

We add all the numbers together, and all the variables

-12u+12=0

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

-12u=-12

u=-12/-12

u=1

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