\(-7 (8 p - 2 q) = -56 p + 14 q\)

\(-6 + (-9 x + 8) = -6 - 9 x + 8 = -9 x + 2\)

\(-6 - (-5 a + 3) = -6 + 5 a - 3 = 5 a - 9\)

\(5 (-9 x - 4) = -45 x - 20\)

\(4 (7 a - 3) + 2 (6 a + 5) = 28 a - 12 + 12 a + 10 = 40 a - 2\)

\(4 p (8 p - 7) = 32 p^{2} - 28 p\)

\((-7 x + 3) + (8 x + 2) = -7 x + 3 + 8 x + 2 = x + 5\)

\((-5 a - 7) - (6 a - 3) = -5 a - 7 + -6 a + 3 = -11 a - 4\)

\(3 (-5 a + 2 b + 9) = -15 a + 6 b + 27\)

\((2 x + 3) (6 y + 7) = 12 x y + 14 x + 18 y + 21\)

\((5 p + 6) (9 p + 8) = 45 p^{2} + 40 p + 54 p + 48 = 45 p^{2} + 94 p + 48\)

\((x - 8) (x - 2) = x^{2} - 2 x - 8 x + 16 = x^{2} - 10 x + 16\)

\((a - 5)^{2} = a^{2} - 10 a + 25\)

\((-7 x + 6)^{2} = 49 x^{2} - 84 x + 36\)

\((-9 a + 2 b)^{2} = 81 a^{2} - 36 a b + 4 b^{2}\)

\((x + 3) (x + 8) (x + 4) = (x + 3) (x^{2} + 12 x + 32) = x^{3} + 12 x^{2} + 32 x + 3 x^{2} + 36 x + 96 = x^{3} + 15 x^{2} + 68 x + 96\)

\(x (x - 4) (x + 7) = x (x^{2} + 3 x - 28) = x^{3} + 3 x^{2} - 28 x\)

\((8 a - 7 b) (8 a + 7 b) = 64 a^{2} - 49 b^{2}\)

\((-7 p + 2) (-7 p - 2) = 49 p^{2} - 4\)

\((a + 5) (a - 5) = a^{2} - 25\)