-9=z/2

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Solution for -9=z/2 equation: 


z in (-oo:+oo)

-9 = z/2 // - z/2

-(z/2)-9 = 0

-1/2*z-9 = 0 // + 9

-1/2*z = 9 // : -1/2

z = 9/(-1/2)

z = -18

z = -18

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