Answer:
-3.5 or -7/2
Step-by-step explanation:
Pentagons have five sides, so 15x+35
15x+35=5
subtract 35
15x+35-35=5x-35
simplify
15x=5x-35
subtract 5x
15x-5x=5x-35-5x
simplify
10x=-35
divide by 10
[tex]\frac{10x}{10}=\frac{-35}{10}[/tex]
simplify
[tex]x=-\frac{7}{2}[/tex] or also -3.5
