Question

1:9x/7-6x=15 2:z/z+15=4/9​

Answer 1

1) 9x/7 - 6x = 15

=> (9x-42x)/7 = 15

=> -33x = 105

=> x = 105/-33

=> x = 3.1818 .

2) z/(z+15) = 4/9

=> 9z = 4z + 60

=> 5z = 60

=> z = 12 .

Hope it's helpful to you.