How I change from: 23.4(I2) − 9.1(I1) − 6.8(I3) = −18 --> 9.1(I1) − 23.4(I2) +6.8(I3) = 18 and also How I change from: 10.1(I3) − 6.8 (I2) = −3  --> 6.8(I2) − 10.1(I3) = 3

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