s/2-9=1 - solution

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Solution for s/2-9=1 equation:

s in (-oo:+oo)

s/2-9 = 1 // - 1

s/2-9-1 = 0

1/2*s-10 = 0 // + 10

1/2*s = 10 // : 1/2

s = 10/1/2

s = 20

s = 20

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