-u+20=7u-20

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Solution for -u+20=7u-20 equation: 



-u+20=7u-20

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1u-(7u-20)+20=0

We get rid of parentheses

-1u-7u+20+20=0

We add all the numbers together, and all the variables

-8u+40=0

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

-8u=-40

u=-40/-8

u=+5

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