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4x-2(5x-8)=40
We move all terms to the left:
4x-2(5x-8)-(40)=0
We multiply parentheses
4x-10x+16-40=0
We add all the numbers together, and all the variables
-6x-24=0
We move all terms containing x to the left, all other terms to the right
-6x=24
x=24/-6
x=-4
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