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115+x/18=120
We move all terms to the left:
115+x/18-(120)=0
We add all the numbers together, and all the variables
x/18-5=0
We multiply all the terms by the denominator
x-5*18=0
We add all the numbers together, and all the variables
x-90=0
We move all terms containing x to the left, all other terms to the right
x=90
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