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12x-(5x+20)=-20
We move all terms to the left:
12x-(5x+20)-(-20)=0
We add all the numbers together, and all the variables
12x-(5x+20)+20=0
We get rid of parentheses
12x-5x-20+20=0
We add all the numbers together, and all the variables
7x=0
x=0/7
x=0
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