42-x=x-12

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Solution for 42-x=x-12 equation: 



42-x=x-12

We move all terms to the left:

42-x-(x-12)=0

We add all the numbers together, and all the variables

-1x-(x-12)+42=0

We get rid of parentheses

-1x-x+12+42=0

We add all the numbers together, and all the variables

-2x+54=0

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

-2x=-54

x=-54/-2

x=+27

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