{ 1*k1*x1 + 1*k1*x2 + 1*k1*x5 = k1*k6, 1*k1*x2 + 1*k1*x3 + 1*k1*x5 = k1*k7, 1*k1*x4 + 1*k1*x5 = k1*k8 }