6x+21=x+6

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



6x+21=x+6

We move all terms to the left:

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

We get rid of parentheses

6x-x-6+21=0

We add all the numbers together, and all the variables

5x+15=0

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

5x=-15

x=-15/5

x=-3

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