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2a = -13 - 3
2a = - 16
a = -16/2
a = -8
bila f (a)= -13, maka :
f(a) = 2a + 3 = -13
2a + 3 - 3 = -13 - 3 (kurangi kedua
ruas dengan 3)
2a = -16
2a/2 = -16/2
a = -8