6x+21=2x+81

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Solution for 6x+21=2x+81 equation: 



6x+21=2x+81

We move all terms to the left:

6x+21-(2x+81)=0

We get rid of parentheses

6x-2x-81+21=0

We add all the numbers together, and all the variables

4x-60=0

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

4x=60

x=60/4

x=15

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