9x+21+12x=180

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



9x+21+12x=180

We move all terms to the left:

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

We add all the numbers together, and all the variables

21x-159=0

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

21x=159

x=159/21

x=7+4/7

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