42=12x-5x

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Solution for 42=12x-5x equation: 



42=12x-5x

We move all terms to the left:

42-(12x-5x)=0

We add all the numbers together, and all the variables

-(+7x)+42=0

We get rid of parentheses

-7x+42=0

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

-7x=-42

x=-42/-7

x=+6

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