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= 4 + 3
= 7
f(3) = -2 . 3 + 3
= -6 + 3
= -3
b. f(a) = -7
-2a + 3 = -7
-2a = -10
a = 5
f(-2)=(-2.(-2))+3
f(-2)= 4+3
f(-2)=7
f(x)=-2x+3
f(3)= (-2.3)+3
f(3)=-6+3
f(3)=-3
b. belum tau caranya tapi yg pasti hasilnya x=5