Polynomial has infinitely many zeros.
Step 1:
Combine like terms:
$$ \, \color{blue}{ \cancel{1}} \, \, \color{green}{ -\cancel{1}} \, \, \color{orange}{ -\cancel{5}} \,+ \, \color{orange}{ \cancel{5}} \, = \color{orange}{0} $$Step 2:
Equation $ 0 = 0 $ has infinitely meny solutions.