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12-x/3=-3
We move all terms to the left:
12-x/3-(-3)=0
We add all the numbers together, and all the variables
-x/3+15=0
We multiply all the terms by the denominator
-x+15*3=0
We add all the numbers together, and all the variables
-1x+45=0
We move all terms containing x to the left, all other terms to the right
-x=-45
x=-45/-1
x=+45
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