7-15=z/-9 - solution

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Solution for 7-15=z/-9 equation:

z in (-oo:+oo)

7-15 = z/(-9) // - z/(-9)

7-(z/(-9))-15 = 0

1/9*z-8 = 0 // + 8

1/9*z = 8 // : 1/9

z = 8/1/9

z = 72

z = 72

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