\left\{ \begin{array} { l } { 3 d ^ { 2 } - 3 l d - l ^ { 2 } - \frac { 3 I } { m } = 0 } \\ { I = 0.12 } \\ { m = 1.5 } \\ { l = 0.84 } \end{array} \right.
Solve for d, l, I, m
d=\frac{21-\sqrt{1229}}{50}\approx -0.281141926\text{, }l=0.84\text{, }I=0.12\text{, }m=1.5
d=\frac{\sqrt{1229}+21}{50}\approx 1.121141926\text{, }l=0.84\text{, }I=0.12\text{, }m=1.5
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