27/12=r^2

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Solution for 27/12=r^2 equation: 


r in (-oo:+oo)

27/12 = r^2 // - r^2

27/12-r^2 = 0

-1*r^2 = -9/4 // : -1

r^2 = 9/4

r^2 = 9/4 // ^ 1/2

abs(r) = 3/2

r = 3/2 or r = -3/2

r in { 3/2, -3/2 }

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