15=z/-2

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Solution for 15=z/-2 equation: 


z in (-oo:+oo)

15 = z/(-2) // - z/(-2)

15-(z/(-2)) = 0

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

1/2*z = -15 // : 1/2

z = -15/1/2

z = -30

z = -30

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