Answer :

find a common denominator to subtract, so smallest common denimator between 7 and 3 is 21
multiply 4/7 by 3/3 and 2/3 by 7/7
12/21-14/21= -2/21
find a common denominator to subtract, so smallest common denimator is 21
 4/7 * 3/3 minus 2/3 * 7/7= -2/21

Other Questions