Write 4 equivalent expressions to 5n + 15n

What value of x is in the solution set of –5x – 15 > 10 + 20x?

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

35 ! insert < , > , or = to make the sentence true. 12 __ 25 > =