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12=-3+x/4
We move all terms to the left:
12-(-3+x/4)=0
We add all the numbers together, and all the variables
-(x/4-3)+12=0
We get rid of parentheses
-x/4+3+12=0
We multiply all the terms by the denominator
-x+3*4+12*4=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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