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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

=0

y=0/1

y=0

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