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= 4 - 15
= -9
f(-6) = 4 - 3 . (-6)
= 4 + 18
= 22
f(a) = 25
4 - 3a = 25
-3a = 21
a = -7
b.f(x) ⇒⇒4-3x
-6⇒⇒4-3x
3x⇒⇒4+6
x⇒⇒10/3
c.f(x)⇒⇒4-3x
f(a)⇒⇒4-3a
25⇒⇒4-3a
21⇒⇒-3a
a=21/-3=-7
f(