z/3=21

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Solution for z/3=21 equation: 


z in (-oo:+oo)

z/3 = 21 // - 21

z/3-21 = 0

1/3*z-21 = 0 // + 21

1/3*z = 21 // : 1/3

z = 21/1/3

z = 63

z = 63

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