Tìm x, biết:

----- Nội dung ảnh -----
**Bài 5: Tìm x, biết:**
a) \( 4 + 2|x| = -4x \)

b) \( |3x - 1| + 2 = x \)

c) \( |x + 15| + 1 = 3x \)

d) \( 7 - x = 5x + 1 \)

e) \( 5x = x - 12 \)

f) \( |2x - 3| + x = 21 \)

**Bài 6: Tìm x, biết:**
a) \( 4|3x - 1| + |x - 2| - 5 + 7|x - 3| = 12 \)

b) \( 3|x + 4| - |2x + 1| - 5|x + 3| + |x - 1| \)

c) \( 2|x - 3| + |x| - 3| - 2| = \frac{2}{5} - x \)

d) \( 2|x + 3\frac{1}{2}| + |x| - 3\frac{1}{2} = \frac{2}{5} - x \)

e) \( |x - 2| + |x - 3| + |2x - 8| = 9 \)

f) \( 3x|x + 1| - 2x|x + 2| = 12 \)