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12-0.80(x+15)=0.40x+6
We move all terms to the left:
12-0.80(x+15)-(0.40x+6)=0
We multiply parentheses
-0.8x-(0.40x+6)-12+12=0
We get rid of parentheses
-0.8x-0.40x-6-12+12=0
We add all the numbers together, and all the variables
-1.2x-6=0
We move all terms containing x to the left, all other terms to the right
-1.2x=6
x=6/-1.2
x=-5
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