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-20+6x=8x+40
We move all terms to the left:
-20+6x-(8x+40)=0
We get rid of parentheses
6x-8x-40-20=0
We add all the numbers together, and all the variables
-2x-60=0
We move all terms containing x to the left, all other terms to the right
-2x=60
x=60/-2
x=-30
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