The solution when solved for b is 14 degrees because angles b and b + 56 are vertically opposite.
When a transversal cuts two parallel lines, some of the angles become congruent.
From the given diagram, the given angles are equal according to the vertical angles theorem.
Both angles are vertically opposite become they meet at a point of intersection.
Hence 5b = b + 56
5b - b = 56
4b = 56
b = 56/4
b = 14
Hence the solution when solved for b is 14 degrees because angles b and b + 56 are vertically opposite.
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