90-y=2y

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Solution for 90-y=2y equation: 



90-y=2y

We move all terms to the left:

90-y-(2y)=0

We add all the numbers together, and all the variables

-3y+90=0

We move all terms containing y to the left, all other terms to the right

-3y=-90

y=-90/-3

y=+30

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