Question

susbract (2/7-5/21 from the sum of 3/4,5/7,7/12

Answer 1

3/4+5/7+7/12

lcm of 4,7,12=84

3x21/84 +5x12/84+7x7/84

(63+60+49)/84

172/84

43/21 eq-1

2/7-5/21

lcm=21

(2x3-5x1)/21

1/21 eq-2

sub 1-2

43/21 - 1/21

42/21

2