z/2=-9 - solution

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Solution for z/2=-9 equation:

z in (-oo:+oo)

z/2 = -9 // + 9

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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