L.C.M of 3,6, and 2 is 6

Thus, multiplying by 6 on both the sides, we get,

⇒ 6x + 42 – 16x = 17 – 15x

By Transposing,

⇒ 6x – 16x + 15x = 17 - 42

⇒ 5x = -25

⇒ x = -25/5 = -5