0.7 (4а + 3b) - 6(0.5 + 0.7b) = 0.7 (4 - 12) - 6 (0.5 - 2.8) = -5.6 +13.8 =8.2
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0.7 (4а + 3b) - 6(0.5 + 0.7b) = 0.7 (4 - 12) - 6 (0.5 - 2.8) = -5.6 +13.8 =8.2