42=x+12

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Solution for 42=x+12 equation: 



42=x+12

We move all terms to the left:

42-(x+12)=0

We get rid of parentheses

-x-12+42=0

We add all the numbers together, and all the variables

-1x+30=0

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

-x=-30

x=-30/-1

x=+30

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