How do you solve z overz plus 2 equals 30 over 42?

Answer 1

Problem:

z/(z + 2) = 30/42

Simplify right hand side by dividing both denominator and numerator by 6:

z/(z + 2) = 5/7

You should see that if z equals 5:

5/(5 + 2) = 5/7

Simplify:

5/7 = 5/7

Answer:

z equals 5.