45=21+s

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Solution for 45=21+s equation: 



45=21+s

We move all terms to the left:

45-(21+s)=0

We add all the numbers together, and all the variables

-(s+21)+45=0

We get rid of parentheses

-s-21+45=0

We add all the numbers together, and all the variables

-1s+24=0

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

-s=-24

s=-24/-1

s=+24

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