z/20=-21 - solution

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Solution for z/20=-21 equation:

z in (-oo:+oo)

z/20 = -21 // + 21

z/20+21 = 0

1/20*z+21 = 0 // - 21

1/20*z = -21 // : 1/20

z = -21/1/20

z = -420

z = -420

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