Question

6. Розв'яжи рiвняння. (2 бали) (7 x + 5)(12x - 2) = (14x + 1)(6x - 4)​

Answer 1

$(7x + 5)(12x - 2) = (14x + 1)(6x - 4) \\ 84 {x}^{2} - 14x + 60x - 10 = 84 {x}^{2} - 56x + 6x - 4 \\ 84 {x}^{2} + 46x - 10 = 84 {x}^{2} - 50x - 4 \\ 84 {x}^{2} + 46x - 84 {x}^{2} + 50x = - 4 + 10 \\ 96x = 6$

х = 6:96 = 1/16