Multiply Python pair by Rational multiplier. Reduce common cross factors.
Examples:
durtools.pair_multiply_reduce_factors(4, 8), Rational(2, 3)) (4, 12)
durtools.pair_multiply_reduce_factors(4, 8), Rational(6, 5)) (12, 20)
durtools.pair_multiply_naive
durtools.prolated_to_written
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