|x - 1| + |3x - 3| = 16
|x - 1| + |3(x - 1)| = 16
|x - 1| + 3|x - 1| = 16
4|x - 1| = 16 /:4
|x - 1| = 4
x - 1 = 4 ∨ x - 1 = -4
x = 5 ∨ x = -3
|6x - 9| + |4x - 6| = 20
|3(2x - 3)| + |2(2x - 3)| = 20
3|2x - 3| + 2|2x - 3| = 20
5|2x - 3| = 20 /:5
|2x - 3| = 4
2x - 3 = 4 ∨ 2x - 3 = -4
2x = 7 ∨ 2x = -1
x = ⁷/₂ ∨ x = -¹/₂
