90-2y=180

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Solution for 90-2y=180 equation: 



90-2y=180

We move all terms to the left:

90-2y-(180)=0

We add all the numbers together, and all the variables

-2y-90=0

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

-2y=90

y=90/-2

y=-45

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