(r/3r-1)=4

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Solution for (r/3r-1)=4 equation: 


r in (-oo:+oo)

(r/3)*r-1 = 4 // - 4

(r/3)*r-4-1 = 0

1/3*r^2 = 5 // : 1/3

r^2 = 15

r^2 = 15 // ^ 1/2

abs(r) = 15^(1/2)

r = 15^(1/2) or r = -15^(1/2)

r in { 15^(1/2), -15^(1/2) }

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