Z/4=21

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Solution for Z/4=21 equation: 


Z in (-oo:+oo)

Z/4 = 21 // - 21

Z/4-21 = 0

1/4*Z-21 = 0 // + 21

1/4*Z = 21 // : 1/4

Z = 21/1/4

Z = 84

Z = 84

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