(10y-9)+(20y+9)=180

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Solution for (10y-9)+(20y+9)=180 equation: 



(10y-9)+(20y+9)=180

We move all terms to the left:

(10y-9)+(20y+9)-(180)=0

We get rid of parentheses

10y+20y-9+9-180=0

We add all the numbers together, and all the variables

30y-180=0

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

30y=180

y=180/30

y=6

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