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5x+(-8x+12)-2(-3x)=20
We move all terms to the left:
5x+(-8x+12)-2(-3x)-(20)=0
We multiply parentheses
5x+(-8x+12)+6x-20=0
We get rid of parentheses
5x-8x+6x+12-20=0
We add all the numbers together, and all the variables
3x-8=0
We move all terms containing x to the left, all other terms to the right
3x=8
x=8/3
x=2+2/3
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