Five times the sum of a number and 27 is greater than or equal to six times the sum of that number and 26. What is the solution set of this problem? O (-21) O (-∞, -21] O [-21,+00) O (21, +00) Five times the sum of a number and 27 is greater than or equal to six times the sum of that number and 26. What is the solution set of this problem ? O ( -21 ) O ( -∞ , -21 ] O [ -21 , + 00 ) O ( 21 , +00 )