Question

(2x-7x)^2-7(7-4x)=0​

Answer 1

Объяснение:

$(2x - 7x) \times 2 - 7 \times (7 - 4x) = 0 \\ - 5x \times 2 - 49 + 28x = 0 \\ - 10x + 28x = 49 \\ 18x = 49 \\ x = \frac{49}{18} = 2\frac{13}{18}$