Question

Помогите ожалуйста срочно

Answer 1

a) $9y(2y + 7) - 3y(6y + 3) = 2y - 2(50 - y) \\ 18 {y}^{2} + 63y - 18 {y }^{2} - 9y = 2y - 100 + 2y \\ 63y - 9y-4y = - 100 \\ 50y = - 100 \\ y = - 100 \div 50 \\ y = - 2\\ \\b)5x - 3x(3 - 4x) + 26 = 2x(6x + 8) \\ 5x - 9x + 12 {x}^{2} + 26 = 12 {x}^{2} + 16x \\ 5x - 9x - 16x = - 26 \\ - 20x = - 26 \\ x = \frac{26}{20 } \\ x = \frac{13}{10 } \\ x = 1 \frac{3}{10}$