Multistep equation 1/2x + 7 = x - 3

Which of the following expressions cannot be simplified to x – 2?

One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.

If bill bought a home for $210,000 and he sold it a year later for $120,000 his percentage of loss is