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-x/12=-3
We move all terms to the left:
-x/12-(-3)=0
We add all the numbers together, and all the variables
-x/12+3=0
We multiply all the terms by the denominator
-x+3*12=0
We add all the numbers together, and all the variables
-1x+36=0
We move all terms containing x to the left, all other terms to the right
-x=-36
x=-36/-1
x=+36
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