y=90-2y

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Solution for y=90-2y equation: 



y=90-2y

We move all terms to the left:

y-(90-2y)=0

We add all the numbers together, and all the variables

y-(-2y+90)=0

We get rid of parentheses

y+2y-90=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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