z/2-1=1 - solution

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Solution for z/2-1=1 equation:

z in (-oo:+oo)

z/2-1 = 1 // - 1

z/2-1-1 = 0

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

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

z = 2/1/2

z = 4

z = 4

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