21x=18x+18

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Solution for 21x=18x+18 equation: 



21x=18x+18

We move all terms to the left:

21x-(18x+18)=0

We get rid of parentheses

21x-18x-18=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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