3y/7y=21

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Solution for 3y/7y=21 equation: 


y in (-oo:+oo)

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

((3*y)/7)*y-21 = 0

3/7*y^2 = 21 // : 3/7

y^2 = 49

y^2 = 49 // ^ 1/2

abs(y) = 7

y = 7 or y = -7

y in { 7, -7 }

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