[tex]2(4a + 3b) - 3(2a + 6b) = 8a + 6b - 6a - 18b = \\ = - 12b + 2a = - 2(6b - a) = - 2 \times ( - 1.9) = 3.8[/tex]
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[tex]2(4a + 3b) - 3(2a + 6b) = 8a + 6b - 6a - 18b = \\ = - 12b + 2a = - 2(6b - a) = - 2 \times ( - 1.9) = 3.8[/tex]