29 Test file number 50

  29.1 Problem number 88
  29.2 Problem number 89
  29.3 Problem number 91
  29.4 Problem number 92
  29.5 Problem number 96
  29.6 Problem number 98

Test folder name:

test_cases/1_Algebraic_functions/1.2_Trinomial_products/1.2.4_Improper/50_1.2.4.2-d_x-^m-a_x^q+b_x^n+c_x^-2_n-q-^p