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

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



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

We move all terms to the left:

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

30x-180=0

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

30x=180

x=180/30

x=6

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