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f(5a - 2) = 2(5a - 2) + 13
f(5a - 2) = 10a - 4 + 13
f(5a - 2) = 10a + 9
untuk mencari a
10a + 9 = 0
10a = -9
a = -9/10
f(5a-2) = 2 ( 5a - 2 ) + 13
= 10a - 4 + 13
= 10a + 9