18x-12=7x+21

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Solution for 18x-12=7x+21 equation: 



18x-12=7x+21

We move all terms to the left:

18x-12-(7x+21)=0

We get rid of parentheses

18x-7x-21-12=0

We add all the numbers together, and all the variables

11x-33=0

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

11x=33

x=33/11

x=3

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