Question

ayuda por favor 7y2 + 7y - 12 = y2 + y

Answer 1

$7y2 + 7y - 12 = y2 + y \\ 7y \times 2 + 7y - 12 = y \times 2 + y \\ 14y + 7y - 12 = 2y + y \\ 21y - 12 = 3y \\ 21y - 3y = 12 \\ 18y = 12 \\ y = 12 \div 18 \\ y = \frac{2}{3}$