(20y-9)+(y+84)=180

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Solution for (20y-9)+(y+84)=180 equation: 



(20y-9)+(y+84)=180

We move all terms to the left:

(20y-9)+(y+84)-(180)=0

We get rid of parentheses

20y+y-9+84-180=0

We add all the numbers together, and all the variables

21y-105=0

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

21y=105

y=105/21

y=5

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