21x-18=8x+21

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Solution for 21x-18=8x+21 equation: 



21x-18=8x+21

We move all terms to the left:

21x-18-(8x+21)=0

We get rid of parentheses

21x-8x-21-18=0

We add all the numbers together, and all the variables

13x-39=0

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

13x=39

x=39/13

x=3

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