3=7+4u

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Solution for 3=7+4u equation: 



3=7+4u

We move all terms to the left:

3-(7+4u)=0

We add all the numbers together, and all the variables

-(4u+7)+3=0

We get rid of parentheses

-4u-7+3=0

We add all the numbers together, and all the variables

-4u-4=0

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

-4u=4

u=4/-4

u=-1

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