\(-9 ⋅ -2 a = 18 a\)

\(4 x ⋅ 7 y = 28 x y\)

\(5 a ⋅ -8 b = -40 a b\)

\(-5 x ⋅ 7 x = -35 x^{2}\)

\(3 p ⋅ q ⋅ 4 r = 12 p q r\)

\(4 x ⋅ -3 y ⋅ -x = 12 x^{2} y\)

\(6 a + a = 7 a\)

\(x y + 6 x y = 7 x y\)

\(5 p + 6 p + 8 p = 19 p\)

Kan niet korter.

\(x ⋅ 0 = 0\)

\(-a ⋅ 9 a b = -9 a^{2} b\)

\(b ⋅ -4 ⋅ -3 a b = 12 a b^{2}\)

\(x + x + x + x + x + x + x + x = 8 x\)

\(8 a - 9 a = -a\)

\(-2 x - 5 x = -7 x\)

\(-9 p q - 5 p q = -14 p q\)

\(0 - 9 a = -9 a\)

Kan niet korter.

\(5 a - 5 a = 0\)

\(6 x + 7 y - 2 x = 4 x + 7 y\)

\(-6 p - 7 q - 2 q = -6 p - 9 q\)

\(-7 x + 9 y + 6 x + 4 y = -x + 13 y\)

\(-5 a + 3 - 9 a - 6 = -14 a - 3\)

\(3 p + -6 q - 8 p = -5 p - 6 q\)

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

\(2 x - 9 x y - 6 y - 3 x y = 2 x - 6 y - 12 x y\)

\(-3 a b + 4 b + 8 a b - 4 b = 5 a b\)