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f(3x+2) = 6(3x+2) + 3
f(3x+2) = 18x + 12 + 3
f(3x+2) = 18x + 15
jadi,
f(-2) = 18x + 15
f(-2) = 18(-2) + 15
f(-2) = (-36) + 15
f(-2) = -21