Simplify: 3a2b−6ab23ab\frac{3a^2b - 6ab^2}{3ab}3ab3a2b−6ab2 (assume a,b≠0a, b \neq 0a,b=0).
a−2ba - 2ba−2b
a2−2b2a^2 - 2b^2a2−2b2
3a−6b3a - 6b3a−6b
a−6ba - 6ba−6b