d : 88 = c rest 75 ⇒ d = 88 c + 75
d : 17 = 7 c rest 13 ⇒ d = 17 x 7 c + 13
⇔ d = 88 c + 75 = 119 c + 13
⇒ 119 c + 13 = 88 c + 75
119 c - 88 c = 75 - 13
31 c = 62
c = 62 : 31
d = 119 x 2 + 13 = 238 + 13
Verific:
251 : 88 = 2 rest 75
251 : 17 = 14 rest 13