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4x-20=8x+40
We move all terms to the left:
4x-20-(8x+40)=0
We get rid of parentheses
4x-8x-40-20=0
We add all the numbers together, and all the variables
-4x-60=0
We move all terms containing x to the left, all other terms to the right
-4x=60
x=60/-4
x=-15
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