u+3u-u-3u+2u=8

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Solution for u+3u-u-3u+2u=8 equation: 



u+3u-u-3u+2u=8

We move all terms to the left:

u+3u-u-3u+2u-(8)=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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