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\(8 p - 7 p = p\)

\(-2 a - a = -3 a\)

\(-9 p q - 6 p q = -15 p q\)

\(-8 x + 0 = -8 x\)

\(-x + 2 y + 3 x = 2 x + 2 y\)

\(4 a - 3 b - 8 b = 4 a - 11 b\)

\(-5 x - 2 y + 6 x + 7 y = x + 5 y\)

\(9 a + 5 + a - 2 = 10 a + 3\)

\(-7 x + -8 y + 4 x = -3 x - 8 y\)

\(6 a - -4 a + 5 b = 10 a + 5 b\)

\(-4 a + 8 a b + 2 b - 7 a b = -4 a + 2 b + a b\)

\(6 p q + 8 q + p q - 8 q = 7 p q\)

Kan niet korter.

Kan niet korter.

\(x + x + x + x = 4 x\)

\(8 x + 3 x = 11 x\)

\(7 a b + 8 a b = 15 a b\)

\(2 a + 3 a + a = 6 a\)

\(6 a - 6 a = 0\)

\(-8 ⋅ -3 x = 24 x\)

\(a ⋅ 6 b = 6 a b\)

\(-2 x ⋅ 4 y = -8 x y\)

\(8 x ⋅ -2 x = -16 x^{2}\)

\(-5 x ⋅ 2 y ⋅ -4 z = 40 x y z\)

\(-2 a ⋅ 4 b ⋅ -5 a = 40 a^{2} b\)

\(0 ⋅ 2 a = 0\)

\(-p ⋅ 4 p q = -4 p^{2} q\)

\(-3 y ⋅ 4 ⋅ -5 x y = 60 x y^{2}\)