The function H(s) is integrable with a period of 2. It is also known that H(s) is an even function.

The function M(y) is such that:

y
∫ H(s) ds = M(y), and:
0

M(1) = B, where B is a nonzero real constant.

Determine the value of M(7) – M(4) in terms of B.