1. 3ху-5у= у(3х-5)
2. 5ав+10а² = 5а (в+2а)
3.2z^5-4z³ = 2z³ (z²-2)
4. 6c²x³-4c³x²+2c²x² = 2c²x² (3x-2c+1)
5. 2x(m-n) - x(y-m) = (n-m) (-2x-1)
6.3c(x-y) - x(y-x) = 6c(x-y) +x(x-y) = (x-y) (6c+x)
