Question

-9/-7+3/4+-8/21 please send the solutions with explanation ​

Answer 1

$\frac{ - 9}{ - 7} + \frac{3}{4} + \frac{ - 8}{21}$

$= \frac{9}{7} + \frac{3}{4} + \frac{ - 8}{21}$

$lcm \: of \: 7 \: \: 4 \: and \: 21 \: is \: 84$

$= \frac{9 \times 12}{7 \times 12} + \frac{3 \times 21}{4 \times 21} + \frac{ - 8 \times 4}{21 \times 4}$

$= \frac{108}{84} + \frac{63}{84} + \frac{ - 32}{84}$

$= \frac{108 +6 3 + ( - 32)}{84}$

$= \frac{108 + 63 - 32}{84}$

$= \frac{139}{84}$

HOPE THIS MAY HELP YOU......