-21=1-2s

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Solution for -21=1-2s equation: 



-21=1-2s

We move all terms to the left:

-21-(1-2s)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

2s-1-21=0

We add all the numbers together, and all the variables

2s-22=0

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

2s=22

s=22/2

s=11

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