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1) -42х - 9 = -90х -117 -54х + 90х = -117 + 9 36х = -108 х = -3 2) 1.2х + 0.6 = -5.4х + 7.2 1.2х + 5.4х = 7.2 -0.6 6.6х = 6.6 х = 1