Need Very Soon Will Give Brainliest

The like terms are:

12x and 8x - they have the same variables

8, 55, 3, and 180 - they are all regular numbers (if you know what I mean)

P = 80 degrees and R = 45 degrees

Step-by-step explanation:

first simplify: 20x + 60 = 180

                              20x = 120

                                   x = 6

next plug in 6 for each equation: 12(6) + 8 = 80  

                                                         8(6) - 3 = 45

finally check to see if the answer is correct: 55 + 45 + 80 = 180