z/2-9=-3 - solution

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Solution for z/2-9=-3 equation:

z in (-oo:+oo)

z/2-9 = -3 // + 3

z/2-9+3 = 0

1/2*z-6 = 0 // + 6

1/2*z = 6 // : 1/2

z = 6/1/2

z = 12

z = 12

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