S(25)=7-4n

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Solution for S(25)=7-4n equation: 



(25)=7-4S

We move all terms to the left:

(25)-(7-4S)=0

We add all the numbers together, and all the variables

-(-4S+7)+25=0

We get rid of parentheses

4S-7+25=0

We add all the numbers together, and all the variables

4S+18=0

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

4S=-18

S=-18/4

S=-4+1/2

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