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2(x+8)+2(x+12)=20
We move all terms to the left:
2(x+8)+2(x+12)-(20)=0
We multiply parentheses
2x+2x+16+24-20=0
We add all the numbers together, and all the variables
4x+20=0
We move all terms containing x to the left, all other terms to the right
4x=-20
x=-20/4
x=-5
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