z/2-z=4 - solution

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Solution for z/2-z=4 equation:

z in (-oo:+oo)

z/2-z = 4 // - 4

z/2-z-4 = 0

-1/2*z-4 = 0 // + 4

-1/2*z = 4 // : -1/2

z = 4/(-1/2)

z = -8

z = -8

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