bantuin no 2 dan 3 ya

2) x sebelah kiri dikali 7 yg per sebelah kanan
7x = 3 + 2x²
3 + 2x² - 7x = 0
2x² - 7x + 3 = 0
(2x - 1)(x - 3) = 0
x = 1/2 atau x = 3

3) x - 1 = 2(x - 1)(x + 3)
x - 1 = 2(x² + 2x - 3)
x - 1 = 2x² + 4x - 6
2x² + 4x - x - 6 + 1 = 0
2x² + 3x - 5 = 0
(2x + 5)(x - 1) = 0
x = -5/2 atau x = 1