tolong dibantu yy guys!! kalau bisa secepatnya

[tex] 4. \: \frac{2a}{3x} \times \frac{2x - 6xy}{12a } \\ = \frac{1}{3x} \times \frac{x \times (2 - 6y)}{6} \\ = \frac{1}{3} \times \frac{2(1 - 3y)}{6} \\ = \frac{1}{3} \times \frac{1 - 3y}{3} \\ = \frac{1 - 3y}{9} [/tex]