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18x+12=42x-12
We move all terms to the left:
18x+12-(42x-12)=0
We get rid of parentheses
18x-42x+12+12=0
We add all the numbers together, and all the variables
-24x+24=0
We move all terms containing x to the left, all other terms to the right
-24x=-24
x=-24/-24
x=1
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