18x=21x+6

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Solution for 18x=21x+6 equation: 



18x=21x+6

We move all terms to the left:

18x-(21x+6)=0

We get rid of parentheses

18x-21x-6=0

We add all the numbers together, and all the variables

-3x-6=0

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

-3x=6

x=6/-3

x=-2

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