-3u=u+8

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Solution for -3u=u+8 equation: 



-3u=u+8

We move all terms to the left:

-3u-(u+8)=0

We get rid of parentheses

-3u-u-8=0

We add all the numbers together, and all the variables

-4u-8=0

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

-4u=8

u=8/-4

u=-2

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