19 + 91 = 110
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72 plus 19 = 91
subtract 19 from 91. this will give you 8X equals 72. then you divide 72 by 8, and therefore X will equal to 9
91 is the dialling code for India. So you would add plus 91 (normally not plus plus 91) to dial a mobile with an Indian number. The phone need not be in India.
Yes: 19 - (-91) = 110
-72