3u+5u-u=7

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Solution for 3u+5u-u=7 equation: 



3u+5u-u=7

We move all terms to the left:

3u+5u-u-(7)=0

We add all the numbers together, and all the variables

7u-7=0

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

7u=7

u=7/7

u=1

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