21=1+6x-x

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Solution for 21=1+6x-x equation: 



21=1+6x-x

We move all terms to the left:

21-(1+6x-x)=0

We add all the numbers together, and all the variables

-(5x+1)+21=0

We get rid of parentheses

-5x-1+21=0

We add all the numbers together, and all the variables

-5x+20=0

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

-5x=-20

x=-20/-5

x=+4

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