21=x-3x-1

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Solution for 21=x-3x-1 equation: 



21=x-3x-1

We move all terms to the left:

21-(x-3x-1)=0

We add all the numbers together, and all the variables

-(-2x-1)+21=0

We get rid of parentheses

2x+1+21=0

We add all the numbers together, and all the variables

2x+22=0

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

2x=-22

x=-22/2

x=-11

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