21/2s+9=45-1/2s

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Solution for 21/2s+9=45-1/2s equation: 


s in (-oo:+oo)

(21/2)*s+9 = 45-((1/2)*s) // - 45-((1/2)*s)

(21/2)*s+(1/2)*s-45+9 = 0

11*s-36 = 0 // + 36

11*s = 36 // : 11

s = 36/11

s = 36/11

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