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eliminasi
-2a+b=-11
2a +b=9
----------------- +
2b = -2
b = -1
subtitusi
2a+b=9
2a-1 = 9
2a = 9+1
2a =10
a =5
jadi jika f (7) =
7a+b
7.5-1
35-1
34 adalah hasilnya