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12-15=x/20
We move all terms to the left:
12-15-(x/20)=0
We add all the numbers together, and all the variables
-(+x/20)+12-15=0
We add all the numbers together, and all the variables
-(+x/20)-3=0
We get rid of parentheses
-x/20-3=0
We multiply all the terms by the denominator
-x-3*20=0
We add all the numbers together, and all the variables
-1x-60=0
We move all terms containing x to the left, all other terms to the right
-x=60
x=60/-1
x=-60
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