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f(2) = -3(2) + 6 = 0
b. f(a) = -3a + 6
-9 = -3a + 6
3a = 9 + 6
3a = 15
a = 5
f ( 2) = -3. 2+6=0
B. f ( a ) = -3 a + 6 = -9
-3 a = -9 -6
a = -15 / -3
a =5