Choose the missing step in the given solution to the inequality −x − 3 < 13 + 3x. −x − 3 < 13 + 3x −4x < 16 x > −4 −4x − 3 > 13 2x − 3 < 18 −4x − 3 < 13 2x − 3 > 18

Frank owns a $141,000 home, for which he has a 30-year mortgage in the amount of $700 a month. once he has paid off mortgage, how much will he have paid in investment? a. $111,000 b. $109,000 c. $120,000 d. $141,000