z/2=-20 - solution

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Solution for z/2=-20 equation:

z in (-oo:+oo)

z/2 = -20 // + 20

z/2+20 = 0

1/2*z+20 = 0 // - 20

1/2*z = -20 // : 1/2

z = -20/1/2

z = -40

z = -40

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