The Balance Point

Find the magic stone where the weights to its LEFT equal the weights to its RIGHT (the stone itself counts for neither). ⚖️

You get the weights. Print the position (from 0) of the first such balance point, or none.

Example:

Input: weights = [1, 7, 3, 6, 5, 6] Output: 3

At position 3 (value 6), the left side (1+7+3=11) equals the right side (5+6=11) — a balance point.