(u+3)=3u-1

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Solution for (u+3)=3u-1 equation: 



(u+3)=3u-1

We move all terms to the left:

(u+3)-(3u-1)=0

We get rid of parentheses

u-3u+3+1=0

We add all the numbers together, and all the variables

-2u+4=0

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

-2u=-4

u=-4/-2

u=+2

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