Algebra I Recipe: Solving Two Step Equations

Solve 2x + 3 = 15 for x.

Solve 2 - 3x = 20 for x.

Ed is three more than twice as old as his brother.  If his brother is seven, how old is Ed?

Solve (x + 2)/3 = 22 for x.

Cindy has twice as many nickels as dimes.  If she has 11 dimes, how much is her change worth?

Kim has four dollars less than three times as much as Glenna.  If Kim has fifty dollars, how much does Glenna have?

Cathy charges fifteen dollars per lawn to cut grass in Whoville.  If she has to buy a new mower for $300, how many lawns will she need to cut in order to pay for the mower AND make$150 more?