3a/7=21

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Solution for 3a/7=21 equation: 


a in (-oo:+oo)

(3*a)/7 = 21 // - 21

(3*a)/7-21 = 0

3/7*a-21 = 0 // + 21

3/7*a = 21 // : 3/7

a = 21/3/7

a = 49

a = 49

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