u+2u=3u+4;u=7

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Solution for u+2u=3u+4;u=7 equation: 



u+2u=3u+4u=7

We move all terms to the left:

u+2u-(3u+4u)=0

We add all the numbers together, and all the variables

u+2u-(+7u)=0

We add all the numbers together, and all the variables

3u-(+7u)=0

We get rid of parentheses

3u-7u=0

We add all the numbers together, and all the variables

-4u=0

u=0/-4

u=0

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