Viral math problem #30 7+3=410, 9+6=315, 2+1=13, 5+4=?

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Can you solve it? 7+3=410
9+6=315
2+1=13
5+4=?
See the solution below.

The right answer is 19
The formula is a+b=a-b,a+b
7+3=7-3,7+3=4,10=410
9+6=9-6,9+6=3,15=315
2+1=2-1,2+1=1,3=13
5+4=5-4,5+4=1,9=19

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