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12-2x=9x+145
We move all terms to the left:
12-2x-(9x+145)=0
We get rid of parentheses
-2x-9x-145+12=0
We add all the numbers together, and all the variables
-11x-133=0
We move all terms containing x to the left, all other terms to the right
-11x=133
x=133/-11
x=-12+1/11
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