7 Test file number 26

  7.1 Problem number 245
  7.2 Problem number 246
  7.3 Problem number 249
  7.4 Problem number 252
  7.5 Problem number 256
  7.6 Problem number 257
  7.7 Problem number 258
  7.8 Problem number 263
  7.9 Problem number 264

Test folder name:

test_cases/1_Algebraic_functions/1.1_Binomial_products/1.1.3_General/26_1.1.3.3-a+b_x^n-^p-c+d_x^n-^q