90+(-1y)=180

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Solution for 90+(-1y)=180 equation: 



90+(-1y)=180

We move all terms to the left:

90+(-1y)-(180)=0

We add all the numbers together, and all the variables

(-1y)-90=0

We get rid of parentheses

-1y-90=0

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

-y=90

y=90/-1

y=-90

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