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U7 = 31
b = 31-6 / 7-2 = 25 / 5 = 5
U2 = 6
a+b = 6
a+5 = 6
a = 6-5
a = 1
U40 = a+39b = 1 + 39×5 = 1+195 = 196
U7 = a+6b = 31
-5b = -25
b = 5
U2 = a+b = 6
a+5 = 6
a =1
U40 = a+39b
= 1 +39 (5)
= 1 + 195
= 196