Question

3/4 + (-5/3) +3/15+ (-5/21)​

Answer 1

$\frac{3}{4} + ( - \frac{5}{3} ) + \frac{3}{15} + ( - \frac{5}{21} )$

$\frac{3}{4} - \frac{5}{3} + \frac{3}{15} - \frac{5}{21}$

LCM of denominators us 420.

$\frac{315 - 700 + 84 - 100}{420}$

$\frac{ - 410}{420}$

Hence the answer is -410/420.

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Answer 2

$\frac{3}{4} + \frac{ - 5}{3} + \frac{3}{15} + \frac{ - 5}{21} \\ \\ \frac{3}{4} + \frac{ - 5}{3} + \frac{1}{5} - \frac{5}{21} \\ \frac {315 - 700 + 84 - 100}{420} \\ \frac{399 - 800}{420} \\ \frac{ - 401}{420} \\ 0.9547$