Answer:
5 months will be the same cost at each gym.
Step-by-step explanation:
As
Let [tex]x[/tex] by the number of months
[tex]75+10x=50+15x[/tex]
[tex]10x=15x-25[/tex]
[tex]-5x=-25[/tex]
[tex]\frac{-5x}{-5}=\frac{-25}{-5}[/tex]
[tex]x=5[/tex]
Therefore, 5 months will be the same cost at each gym.