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f(a)= -7
a). bayangan dari -2 => f(-2) = -2(-2) + 3 = 4 + 3 = 7
f(3) = -2(3) + 3 = -6 + 3 = -3
b). f(a)= -2(a) + 3 = -7
= -2a + 3 =-7
= -2a = -7 - 3
= -2a = -10
= a = -10/-2 = 5
seingat saya seperti ini :-)