21=6x-3-6

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Solution for 21=6x-3-6 equation: 



21=6x-3-6

We move all terms to the left:

21-(6x-3-6)=0

We add all the numbers together, and all the variables

-(6x-9)+21=0

We get rid of parentheses

-6x+9+21=0

We add all the numbers together, and all the variables

-6x+30=0

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

-6x=-30

x=-30/-6

x=+5

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