Question

17=p-3-3p

Answer 1

17=p-3-3p combine like terms so p plus -3p
17=3-2p add 3 on both sides
20=2p divide by 2 on both sides
10=p

-23=2a-10-a combine like terms
-23=a-10 add ten on both sides
-13=a

Answer 2

17 = p-3p -3
17 = -2p - 3
20 = -2p
-10 = p