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6+12x=-8.5x-40
We move all terms to the left:
6+12x-(-8.5x-40)=0
We get rid of parentheses
12x+8.5x+40+6=0
We add all the numbers together, and all the variables
20.5x+46=0
We move all terms containing x to the left, all other terms to the right
20.5x=-46
x=-46/20.5
x=-2+1/4.1
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