12x-9+2x+21=180

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Solution for 12x-9+2x+21=180 equation: 



12x-9+2x+21=180

We move all terms to the left:

12x-9+2x+21-(180)=0

We add all the numbers together, and all the variables

14x-168=0

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

14x=168

x=168/14

x=12

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