9x+120=21x+84

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Solution for 9x+120=21x+84 equation: 



9x+120=21x+84

We move all terms to the left:

9x+120-(21x+84)=0

We get rid of parentheses

9x-21x-84+120=0

We add all the numbers together, and all the variables

-12x+36=0

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

-12x=-36

x=-36/-12

x=+3

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