Circuit Theory/Source Injection/code

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numeric::linsolve([
(1-va)/2 - (va-vb)/4 - va/5,
(1-vb)/3 + (va-vb)/4 - vb/6,
current = (1-va)/2 + (1-vb)/3],[va,vb,current])

[va = 0.7051282051, vb = 0.6794871795, current = 0.2542735043]

current = 0.2542735043;
vs = 1;
Req = vs/current