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0.8x+12=x-12
We move all terms to the left:
0.8x+12-(x-12)=0
We get rid of parentheses
0.8x-x+12+12=0
We add all the numbers together, and all the variables
-0.2x+24=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-24
x=-24/-0.2
x=+120
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