18x-21=2x-9

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Solution for 18x-21=2x-9 equation: 



18x-21=2x-9

We move all terms to the left:

18x-21-(2x-9)=0

We get rid of parentheses

18x-2x+9-21=0

We add all the numbers together, and all the variables

16x-12=0

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

16x=12

x=12/16

x=3/4

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