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38 = 50-x
x = 50-38
x = 12
16. c
17.
f (x) = 3x + 10
f (-1) = a
f (b) = -2
f (-1) = a
a = 3 (-1) + 10
a = -3 + 10
a = 7
f (b) = -2
-2 = 3(b) + 10
-2 -10 = 3b
-12 = 3b
-4 = b
a + b = 7 + (-4)
= 3
**maaf kalau salah