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-(y/2)+2y=90
We move all terms to the left:
-(y/2)+2y-(90)=0
We add all the numbers together, and all the variables
-(+y/2)+2y-90=0
We add all the numbers together, and all the variables
2y-(+y/2)-90=0
We get rid of parentheses
2y-y/2-90=0
We multiply all the terms by the denominator
2y*2-y-90*2=0
We add all the numbers together, and all the variables
-1y+2y*2-180=0
Wy multiply elements
-1y+4y-180=0
We add all the numbers together, and all the variables
3y-180=0
We move all terms containing y to the left, all other terms to the right
3y=180
y=180/3
y=60
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