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3x+2(x-10)=4x-20
We move all terms to the left:
3x+2(x-10)-(4x-20)=0
We multiply parentheses
3x+2x-(4x-20)-20=0
We get rid of parentheses
3x+2x-4x+20-20=0
We add all the numbers together, and all the variables
x=0
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