21x-21=27x-81

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Solution for 21x-21=27x-81 equation: 



21x-21=27x-81

We move all terms to the left:

21x-21-(27x-81)=0

We get rid of parentheses

21x-27x+81-21=0

We add all the numbers together, and all the variables

-6x+60=0

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

-6x=-60

x=-60/-6

x=+10

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