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a + 3b = 7
U11 = 21
a + 10b = 21
____________-
-7b = -14
b = 2
a + 3.2 = 7
a + 6 = 7
a = 1
U30 = a + 29b = 1 + 2(29) = 1 + 58 = 59
u4 = a + 3b = 7
u11 = a+ 10b = 21
Eliminasi :
a + 10b = 21
a + 3b = 7 _
7b = 14
b = 2
Subsitusi :
a + 3b = 7
a + 3(2) = 7
a = 7 - 6 = 1
a = 1
Maka :
u30 = a + 29b
= 1 + 29(2)
= 1 + 58
u30 = 59