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6 + 10 = -2a
16 = -2a
-8 = a
f(-2)= 6
f(-2)= a(-2) - 10= 6
= -2a - 10= 6
= -2a= 6 + 10
= -2a= 16
= a= 16/-2
= a= -8
Jadi, nilai a adalah -8.