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-3a = -18
a = 6
5a+b = 35
5×6 +b = 35
b = 5
f(x) = 29
6x+5 = 29
6x = 24
x = 4
8a+b=53....(2)
pers 1 dan 2 dieleminasi
-3a = --18
a=6, b= 5
jadi pers: 6x + 5 = 29
6x = 24
x = 4