Tolong yg a dan b dengan caranya

[tex]a) \: 6p - 8 = 4p + 6 \\ 6p = 4p + 6 + 8 \\ 6p = 4p + 14 \\ 6p + 4p = 14 \\ 2p = 14 \\ p = \frac{14}{2} \\ p = 7 \\ \\ b)4y {}^{2} + 12y - 5y - 15 = 4y { }^{2} + 20y + 25 \\ 4y {}^{2} + 7y - 15 = 4y {}^{2} + 20y + 25 \\ 7y - 15 = 20y + 25 \\ - 15 = 20y + 25 - 7y \\ - 15 = 13y + 25 \\ - 15 - 25 = 13y \\ - 40 = 13y \\ - \frac{40}{13} = y \\ y = - \frac{40}{13} [/tex]