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y=1/2(70-30)
We move all terms to the left:
y-(1/2(70-30))=0
We add all the numbers together, and all the variables
y-(1/240)=0
We get rid of parentheses
y-1/240=0
We multiply all the terms by the denominator
y*240-1=0
Wy multiply elements
240y-1=0
We move all terms containing y to the left, all other terms to the right
240y=1
y=1/240
y=1/240
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