\left\{ \begin{array} { l } { 3 I _ { 1 } - I _ { 2 } - 2 I _ { 3 } = 7 - u } \\ { 6 I _ { 2 } - 3 I _ { 3 } - I _ { 1 } = 0 } \\ { 6 I _ { 3 } - 2 I _ { 1 } - 3 I _ { 2 } = u } \\ { 7 = I _ { 3 } - I _ { 1 } } \end{array} \right.
Solve for I_1, I_2, I_3, u
I_{1}=-3
I_{2} = \frac{3}{2} = 1\frac{1}{2} = 1.5
I_{3}=4
u = \frac{51}{2} = 25\frac{1}{2} = 25.5
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