21=45-s

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Solution for 21=45-s equation: 



21=45-s

We move all terms to the left:

21-(45-s)=0

We add all the numbers together, and all the variables

-(-1s+45)+21=0

We get rid of parentheses

1s-45+21=0

We add all the numbers together, and all the variables

s-24=0

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

s=24

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