I REALLY NEED AN ANSWER! WILL MARK BRAINLIEST Misha solves the following system of equations using the substitution method.

y=5−2x
3x−y=15

What is the single-variable equation she solves after substituting?

A. 3(5+x)=5−2x

B. 15+3x=5−2x

C. 3x−(5−2x)=15

D. 3x−5−2x=15