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20(-x-3)=-120
We move all terms to the left:
20(-x-3)-(-120)=0
We add all the numbers together, and all the variables
20(-1x-3)-(-120)=0
We add all the numbers together, and all the variables
20(-1x-3)+120=0
We multiply parentheses
-20x-60+120=0
We add all the numbers together, and all the variables
-20x+60=0
We move all terms containing x to the left, all other terms to the right
-20x=-60
x=-60/-20
x=+3
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