21=8-3x

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Solution for 21=8-3x equation: 



21=8-3x

We move all terms to the left:

21-(8-3x)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

3x-8+21=0

We add all the numbers together, and all the variables

3x+13=0

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

3x=-13

x=-13/3

x=-4+1/3

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