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42x+2=12x-2
We move all terms to the left:
42x+2-(12x-2)=0
We get rid of parentheses
42x-12x+2+2=0
We add all the numbers together, and all the variables
30x+4=0
We move all terms containing x to the left, all other terms to the right
30x=-4
x=-4/30
x=-2/15
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