S=7.5f-21

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Solution for S=7.5f-21 equation: 



=7.5S-21

We move all terms to the left:

-(7.5S-21)=0

We get rid of parentheses

-7.5S+21=0

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

-7.5S=-21

S=-21/-7.5

S=2+6/7.5

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