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-3x+2(2x+6)=20
We move all terms to the left:
-3x+2(2x+6)-(20)=0
We multiply parentheses
-3x+4x+12-20=0
We add all the numbers together, and all the variables
x-8=0
We move all terms containing x to the left, all other terms to the right
x=8
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