my group was given this equation to be solved using matlab software,but i dont know how to write down the function

since im a first time user of matlab,please help me ASAP

f(x) = [(4+x)/ (42-2x) 2(30-x)] – 0.015

Lower limit = 0

Upper limit = 20

Єs = 0.5 %

The zero lies approximately at 16 using graphical method

Now I need to solve this using bisection method using matlab software

Please help me