18x-15=21x+3

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Solution for 18x-15=21x+3 equation: 



18x-15=21x+3

We move all terms to the left:

18x-15-(21x+3)=0

We get rid of parentheses

18x-21x-3-15=0

We add all the numbers together, and all the variables

-3x-18=0

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

-3x=18

x=18/-3

x=-6

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