Question

Minus 6 by 13 minus minus 7 by 15

Answer 1

the answer is 1/195. (minus and minus became +)

Answer 2

$\frac{ - 6}{13} - \frac{ - 7}{15} \\ \frac{( - 6 \times 15) - ( - 7 \times 13)}{195} \\ \frac{ - 90 + 91}{195} \\ \frac{1}{195}$