s/2-3=12 - solution

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Solution for s/2-3=12 equation:

s in (-oo:+oo)

s/2-3 = 12 // - 12

s/2-12-3 = 0

1/2*s-15 = 0 // + 15

1/2*s = 15 // : 1/2

s = 15/1/2

s = 30

s = 30

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