comp_mul_right

∀ {α : Type u_1} [inst : Semigroup α] (x y : α), ((fun x_1 => x_1 * x) ∘ fun x => x * y) = fun x_1 => x_1 * (y * x)

Composing two multiplications on the right by y and x is equal to a multiplication on the right by y * x.

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