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5x 1 +2.8x 2 +x 3 = −3a +53.22x 2 +4.8x 3 = −0.4a +5−1.16398 x 3 = −1.98634 a −3.52081−1.98634 a − 3.52081x 3 = = 1.7065101(1.7725141 + a)−1.16398x 2 = 5 − 4.8 x 3 − 0.4 a= −2.66809a − 2.956243.22x 1 = 5 − 2.8 x 2 − x 3 − 3a= 0.55282818 a + 2.05053365