21=3+2x-8x

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Solution for 21=3+2x-8x equation: 



21=3+2x-8x

We move all terms to the left:

21-(3+2x-8x)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

6x-3+21=0

We add all the numbers together, and all the variables

6x+18=0

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

6x=-18

x=-18/6

x=-3

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