Answer:
x+3
Step-by-step explanation:
If you factor 5 out of the denominator of the first expression, 5x+15 turns into 5(x+3).
Then, since you have x+3 in the numerator and denominator, it will cancel out.
The steps are shown below:

Ive attached an image that shows an example of simplifying an expression using a the same technique.
180-96= 84
That means 8x+12=84
84-12=72
That means 8x=72
72÷8=9
therefore X=9
Fractions Decimals Percents
1/4 0.25 25%
4/5 0.80 80%
3/4 0.75 75%
33/100 0.33 33%
1/10 0.10 10%
33/50 0.66 66%
1/8 0.125 12.5%
2/4 0.50 50%
Everything is put into order how it’s supposed to be on the chart! :) hope this helps you out a lot. Have a wonderful day❤️
30% decrease.
120-90 = 30
A is your answer!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!