(1/2)s=21 - solution

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Solution for (1/2)s=21 equation:

s in (-oo:+oo)

(1/2)*s = 21 // - 21

(1/2)*s-21 = 0

1/2*s-21 = 0 // + 21

1/2*s = 21 // : 1/2

s = 21/1/2

s = 42

s = 42

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