90+(90-y)+y=180

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



90+(90-y)+y=180

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

y-1y+90-90=0

We add all the numbers together, and all the variables

=0

y=0/1

y=0

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