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-4(-3-5x)=12
We move all terms to the left:
-4(-3-5x)-(12)=0
We add all the numbers together, and all the variables
-4(-5x-3)-12=0
We multiply parentheses
20x+12-12=0
We add all the numbers together, and all the variables
20x=0
x=0/20
x=0
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