Question

what is the answer is 5p -8=1+ 5p -9

Answer 1

Lets solve it
5p-8=1+5p-9     
Lets simply if
5p-8=5p-8   /+8 add 8 both sides
5p=5p 
Now lets think about it.
Its no matter what number we substitute to p, because on both sides we have 5p. It means that equation has infinitely many solution.

Answer 2

-8= 1+5p -9  ->  -5p=1-9+8 -> -5p=9-9 -> 5p