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y/2-12+y=90
We move all terms to the left:
y/2-12+y-(90)=0
We add all the numbers together, and all the variables
y+y/2-102=0
We multiply all the terms by the denominator
y*2+y-102*2=0
We add all the numbers together, and all the variables
y+y*2-204=0
Wy multiply elements
y+2y-204=0
We add all the numbers together, and all the variables
3y-204=0
We move all terms containing y to the left, all other terms to the right
3y=204
y=204/3
y=68
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