18x-21=9x+12

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Solution for 18x-21=9x+12 equation: 



18x-21=9x+12

We move all terms to the left:

18x-21-(9x+12)=0

We get rid of parentheses

18x-9x-12-21=0

We add all the numbers together, and all the variables

9x-33=0

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

9x=33

x=33/9

x=3+2/3

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