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x/5-9=-12
We move all terms to the left:
x/5-9-(-12)=0
We add all the numbers together, and all the variables
x/5+3=0
We multiply all the terms by the denominator
x+3*5=0
We add all the numbers together, and all the variables
x+15=0
We move all terms containing x to the left, all other terms to the right
x=-15
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