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12-1.5x=20
We move all terms to the left:
12-1.5x-(20)=0
We add all the numbers together, and all the variables
-1.5x-8=0
We move all terms containing x to the left, all other terms to the right
-1.5x=8
x=8/-1.5
x=-5+0.5/1.5
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