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u4 =17
u4 =17 - 37
= -20
jadi baris pertama adalah u4 = 17 + -20 = - 3
-20 + -3 = -23
jdi beda nya adllh -23
a + 8b = 37
-5b=-20
b=4
a + 12=17
a=5
U20= 5 + 19(4) = 81