One winter night the temperature fell 15 degrees between midnight and 5 a. m. by 9 a. m.the temperature had doubled from what it was at 5 a. m. by noon, it had risen another 12 degrees to 34 degrees. what was the temperature at midnight?
26 is not the correct answer.

example 2 – simplify: step 1: completely factor both the numerators and denominators of all fractions. step 2: change the division sign to a multiplication sign and flip (or reciprocate) the fraction after the division sign; essential you need to multiply by the reciprocal. step 3 : cancel or reduce the fractions.