42=12-10x

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Solution for 42=12-10x equation: 



42=12-10x

We move all terms to the left:

42-(12-10x)=0

We add all the numbers together, and all the variables

-(-10x+12)+42=0

We get rid of parentheses

10x-12+42=0

We add all the numbers together, and all the variables

10x+30=0

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

10x=-30

x=-30/10

x=-3

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