m/4=21

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Solution for m/4=21 equation: 


m in (-oo:+oo)

m/4 = 21 // - 21

m/4-21 = 0

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

1/4*m = 21 // : 1/4

m = 21/1/4

m = 84

m = 84

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