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21+a+2=16
23+a=16
a=-7
f(3) = 16
7x +(a+2)
7.3 + (a+2)= 16
21 + (a+2) = 16
a+2 = 16-21
a+2 = -5
a = -5 - 2
a = -7
jawabannya d. = -7