I don’t quite know how to do this. Can anyone explain?

Answer:
x = 7
Step-by-step explanation:
∵ Δ KVW is similar to Δ KML
∴ KV/ KL = KW/KM
∴ 44/17x+2 = 56/154
∴ 56 × (17x+2) = 44 × 154
∴ 17x + 2 = 44 × 154 / 56
∴ 17x + 2 = 121
∴ 17x = 119
∴ x = 7