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-22.5*X_2 - 22.5*X_4 + 5 = 0 , -30*X_3 + 50*X_6 + 22.5*X_2 = 0 , -50*X_6 - 25*X_5 + 22.5*X_4 = 0, X_6 = (X_2 -X_4), X_5 = (X_3 + X_6), X_1 = X_2+X_3
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