# Math Help - Expressing this expression as a single fraction in lowest terms.

1. ## Expressing this expression as a single fraction in lowest terms.

Could someone please explain this problem for me? I'm pretty stumped.

Express as single fraction in lowest terms.
-3+(9t-3z)/(7t)+(7t+4z)/(4t)

Thanks so much for all your help!

2. Hello,

For example,

$\frac{9t-3z}{7t}=\frac{9{\color{red}t}}{7{\color{red}t}}-\frac{3z}{7t}=\frac 97 - \frac 37 \frac zt$