(y)+(90)+(y-30)=180

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Solution for (y)+(90)+(y-30)=180 equation: 



(y)+(90)+(y-30)=180

We move all terms to the left:

(y)+(90)+(y-30)-(180)=0

We add all the numbers together, and all the variables

y+(y-30)-90=0

We get rid of parentheses

y+y-30-90=0

We add all the numbers together, and all the variables

2y-120=0

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

2y=120

y=120/2

y=60

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