3+u=3u-5

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Solution for 3+u=3u-5 equation: 



3+u=3u-5

We move all terms to the left:

3+u-(3u-5)=0

We get rid of parentheses

u-3u+5+3=0

We add all the numbers together, and all the variables

-2u+8=0

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

-2u=-8

u=-8/-2

u=+4

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