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x+42=12+2x
We move all terms to the left:
x+42-(12+2x)=0
We add all the numbers together, and all the variables
x-(2x+12)+42=0
We get rid of parentheses
x-2x-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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