Awireless carrier offers the following plans that a person is considering.
the family plan: $100 monthly fee, unlimited talk and text on up to 5 lines, and data charges of $45 for each device for up to 2 gb of data per device.
the mobile share plan: $130 monthly fee for up to 10 devices, unlimited talk and text for all the lines, and data charges of $35 for each device up to a shared total of 10 gb of data
assuming they stay under their data limit, find the number of devices that would make the two plans equal in cost.