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(-9)+x/4=(-15)
We move all terms to the left:
(-9)+x/4-((-15))=0
We add all the numbers together, and all the variables
x/4+6=0
We multiply all the terms by the denominator
x+6*4=0
We add all the numbers together, and all the variables
x+24=0
We move all terms containing x to the left, all other terms to the right
x=-24
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