H/6+9=21 - solution

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Solution for H/6+9=21 equation:

H in (-oo:+oo)

H/6+9 = 21 // - 21

H/6-21+9 = 0

1/6*H-12 = 0 // + 12

1/6*H = 12 // : 1/6

H = 12/1/6

H = 72

H = 72

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