m/2-9=12 - solution

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Solution for m/2-9=12 equation:

m in (-oo:+oo)

m/2-9 = 12 // - 12

m/2-12-9 = 0

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

1/2*m = 21 // : 1/2

m = 21/1/2

m = 42

m = 42

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