\(6 (-2 x - 4 y) = -12 x - 24 y\)

\(-4 (2 a + 5) = -8 a - 20\)

\(9 (-8 p + 6 q - 7) = -72 p + 54 q - 63\)

\(-3 (-6 a + 8) + 4 (-9 a - 7) = 18 a - 24 - 36 a - 28 = -18 a - 52\)

\(5 x (-2 x + 3) = -10 x^{2} + 15 x\)

\(-2 + (7 p + 3) = -2 + 7 p + 3 = 7 p + 1\)

\(-4 - (8 a + 3) = -4 - 8 a - 3 = -8 a - 7\)

\((2 a + 3) (6 b - 7) = 12 a b - 14 a + 18 b - 21\)

\((2 x - 9) (7 x + 3) = 14 x^{2} + 6 x - 63 x - 27 = 14 x^{2} - 57 x - 27\)

\((x + 5) (x - 3) = x^{2} - 3 x + 5 x - 15 = x^{2} + 2 x - 15\)

\((2 x + 6) + (9 x + 7) = 2 x + 6 + 9 x + 7 = 11 x + 13\)

\((5 x - 2) - (4 x - 6) = 5 x - 2 + -4 x + 6 = x + 4\)

\((x - 7) (x + 3) (x - 4) = (x - 7) (x^{2} - x - 12) = x^{3} - x^{2} - 12 x - 7 x^{2} + 7 x + 84 = x^{3} - 8 x^{2} - 5 x + 84\)

\(a (a + 7) (a + 6) = a (a^{2} + 13 a + 42) = a^{3} + 13 a^{2} + 42 a\)

\((x - 7)^{2} = x^{2} - 14 x + 49\)

\((9 p - 5)^{2} = 81 p^{2} - 90 p + 25\)

\((-8 a + 4 b)^{2} = 64 a^{2} - 64 a b + 16 b^{2}\)

\((8 x + 3 y) (8 x - 3 y) = 64 x^{2} - 9 y^{2}\)

\((4 p + 6) (4 p - 6) = 16 p^{2} - 36\)

\((x - 9) (x + 9) = x^{2} - 81\)