(5 / 12-1 / 19) * how to calculate 12-7 / 9

(5 / 12-1 / 19) * after 12 - 7 / 19 is 7 / 19
=5 / 12 * 12-1 / 19 * 12 - 7 / 19 is a multiplication allocation law
=5- 12/19 -7/19
=5 - (12 / 19 + 7 / 19) subtraction can be equal to subtracting their sum
=5-1
=4

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