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y=(12(3)-8)+(12(3)-8)+(9(3)+8)
We move all terms to the left:
y-((12(3)-8)+(12(3)-8)+(9(3)+8))=0
We add all the numbers together, and all the variables
y-(115+115+101)=0
We add all the numbers together, and all the variables
y-331=0
We move all terms containing y to the left, all other terms to the right
y=331
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