–19 + 4r + 4 = –15 + 4r

I am not sure what are we supposed to do but I guess we have to solve it?

0=0

Step-by-step explanation:

first rearrange the formula to get all r's on one side so it's gonna be:

4r-4r=-15+19-4

we really come to a closed end here because 4r-4r=0  

it's gonna be 0=-15+19-4

0=0

Mkae sure you copied the question correctly

p.s: I'm not sure

hi friend

here is your answer

there are two angles that are alternate interior angle with angle 9

the angle 15 and angle 7 are alternate interior angle with angle 9.

hope it is for you so mark my answer as a brainliest

c-4 is the final answer! : )