9x-18=21x-84

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Solution for 9x-18=21x-84 equation: 



9x-18=21x-84

We move all terms to the left:

9x-18-(21x-84)=0

We get rid of parentheses

9x-21x+84-18=0

We add all the numbers together, and all the variables

-12x+66=0

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

-12x=-66

x=-66/-12

x=5+1/2

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