can someone please explain!! i need some help out here thank you

Answer: RP=16
Step-by-step explanation:
RP=RQ+QP
RQ=11
QP=x-3
RP=3x-8
Hence,
3x-8=11+(x-3)
3x-8=11+x-3
3x-8=x+8
3x-8+8=x+8+8
3x=x+16
3x-x=x+16-x
2x=16
Divide both parts of the equation by 2:
x=8
Thus,
RP=3*8-8
RP=24-8
RP=16