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s/9=(-12)-(-7)
We move all terms to the left:
s/9-((-12)-(-7))=0
We add all the numbers together, and all the variables
s/9+5=0
We multiply all the terms by the denominator
s+5*9=0
We add all the numbers together, and all the variables
s+45=0
We move all terms containing s to the left, all other terms to the right
s=-45
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