연립 방정식: 4 (x - 2) (x + 5) - (2x - 3) (2x + 1) = 5.

연립 방정식: 4 (x - 2) (x + 5) - (2x - 3) (2x + 1) = 5.

4 (x2 + 3x - 10) - (4x 2 - 4x - 3) = 5, 4x 2 + 12x - 40 - 4x 2 + 4 x + 3 = 5, 16x = 42, x = 218.