-23 - = -1.5 + (-4.3) x 5, 19.2 - = 7.2 x 4 + (-3.2-6.4), 2.8 - = 6.4+(-3.6), -3.4 - = 2.4 + (-5.8), -2.1 - = 2+2-6.1,

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