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-2a + b = -7... Persamaan 1
f(2) ~> a(2) + b = 5
2a + b = 5... Persamaan 2
-2a + b = -7
2a + b = 5 +
2b = -2
b = -2/2
b = -1
2a + b = 5
2a + (-1) = 5
2a = 5 + 1
2a = 6
a = 3