Answer:
30N to the left.
Step-by-step explanation:
There is no net vertical force as the 45N force upwards and the 45N force downwards cancel each other out.
Horizontally, the resultant force is the 30N to the left as the 45N force to the left is in opposite direction to the 15N force to the right, so they are subtracted:
45N - 15N = 30N
Hope this helps!