3y/7=21

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Solution for 3y/7=21 equation: 


y in (-oo:+oo)

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

(3*y)/7-21 = 0

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

3/7*y = 21 // : 3/7

y = 21/3/7

y = 49

y = 49

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