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2x+141=12x-9
We move all terms to the left:
2x+141-(12x-9)=0
We get rid of parentheses
2x-12x+9+141=0
We add all the numbers together, and all the variables
-10x+150=0
We move all terms containing x to the left, all other terms to the right
-10x=-150
x=-150/-10
x=+15
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