42=12u-5u

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Solution for 42=12u-5u equation: 



42=12u-5u

We move all terms to the left:

42-(12u-5u)=0

We add all the numbers together, and all the variables

-(+7u)+42=0

We get rid of parentheses

-7u+42=0

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

-7u=-42

u=-42/-7

u=+6

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