u+3u+4u-u=12

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Solution for u+3u+4u-u=12 equation: 



u+3u+4u-u=12

We move all terms to the left:

u+3u+4u-u-(12)=0

We add all the numbers together, and all the variables

7u-12=0

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

7u=12

u=12/7

u=1+5/7

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