18x+5=21x-7

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Solution for 18x+5=21x-7 equation: 



18x+5=21x-7

We move all terms to the left:

18x+5-(21x-7)=0

We get rid of parentheses

18x-21x+7+5=0

We add all the numbers together, and all the variables

-3x+12=0

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

-3x=-12

x=-12/-3

x=+4

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