11=21-2s

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Solution for 11=21-2s equation: 



11=21-2s

We move all terms to the left:

11-(21-2s)=0

We add all the numbers together, and all the variables

-(-2s+21)+11=0

We get rid of parentheses

2s-21+11=0

We add all the numbers together, and all the variables

2s-10=0

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

2s=10

s=10/2

s=5

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