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11 and 15 both go into 165. 165 is the LCM (Least Common Multiple) of 11 and 15.
As 11 is prime, only 1 will go into both.
2/5 (2 over 5) both go into 77. If you have trouble with these, just divide by small numbers first like me, 154 and 385 both go into 7 which make 22 and 55 when divided and they go into 11 making 2 and 5.
15 and 5 both go into every multiple of 15 .
8z-5 = 11 add 5 to both sides 8z = 16 divide both sides by 8 z = 2