sederhanakanlah bentuk aljabar berikut!

[tex]a. \\ 3(4x + 2) - 5(7x + 4) \\ 12x + 6 - 35x - 20 \\ - 23x - 14 \\ b. \\ \frac{16 {x}^{3} {y}^{2} }{7 {x}^{2} {y}^{2} } \div \frac{20 {x}^{2}y }{21x {y}^{2} } \\ \frac{16 {x}^{3} {y}^{2} }{7 {x}^{2} {y}^{2} } \times \frac{ 21x {y}^{2}}{20 {x}^{2}y } \\ \frac{16x}{7} \times \frac{21y}{20x} \\ \frac{16x \times 21y}{7 \times 20x} \\ \frac{4 \times 3y}{5} = \frac{12y}{5} [/tex]

Maaf kalo salah, semoga membantu