21/2s+21 - solution

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Solution for 21/2s+21 equation:

s in (-oo:+oo)

(21/2)*s+21 = 0

21/2*s+21 = 0 // - 21

21/2*s = -21 // : 21/2

s = -21/21/2

s = -2

s = -2

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