144/169=r^2

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Solution for 144/169=r^2 equation: 


r in (-oo:+oo)

144/169 = r^2 // - r^2

144/169-r^2 = 0

-1*r^2 = -144/169 // : -1

r^2 = 144/169

r^2 = 144/169 // ^ 1/2

abs(r) = 12/13

r = 12/13 or r = -12/13

r in { 12/13, -12/13 }

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