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f(2) = -3.2 + 6 = 0
2. f(a) = -9
-3a + 6 = -9
-3a = -15
a = 5
f(x) = -3x + 6
f(-3) = 15
f(x) = -3x + 6
f(2) = 0
_____________________________
2).
f(x) = -3x + 6
f(a) = -9
-9 = -3a + 6
3a = 15
a = 5