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x/12+9=-3
We move all terms to the left:
x/12+9-(-3)=0
We add all the numbers together, and all the variables
x/12+12=0
We multiply all the terms by the denominator
x+12*12=0
We add all the numbers together, and all the variables
x+144=0
We move all terms containing x to the left, all other terms to the right
x=-144
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