no 16 ya ka pake cara

a+4b=14
a+7b=26
________-
-4b = -12
b= 3

a+3b=14
a+3(3)=14
a+9=14
a=14-9
a=5

u20=5+(20-1)3
=5+(19)3
=5+57
=62

semoga terbantuuu

U8 = a+7b = 26
U4 = a+3b = 14
Trus dikurang
4b = 12
b = 3

Kemudian cari a [U1] nya

a+3b = 14
a+3(3) = 14
a+9 = 14
a = 14-9
a = 5

U20 = a+19b
= 5 + 19(3)
= 5 + 57
= 62