[tex]2a(7 - b) - 3(b - 3a) = 14a - 2ab - 3b + 9a = 23a - 2ab - 3b[/tex]
[tex] - 6(2a - 3b) - 7(6a - 3b) = - 12a + 18b - 42a + 21b = - 54a + 39b[/tex]
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[tex]2a(7 - b) - 3(b - 3a) = 14a - 2ab - 3b + 9a = 23a - 2ab - 3b[/tex]
[tex] - 6(2a - 3b) - 7(6a - 3b) = - 12a + 18b - 42a + 21b = - 54a + 39b[/tex]