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 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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