(21x)-9=180

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Solution for (21x)-9=180 equation: 



(21x)-9=180

We move all terms to the left:

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

We add all the numbers together, and all the variables

21x-189=0

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

21x=189

x=189/21

x=9

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