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-2 *-2 +3=4+3=7
-2*3+3=-6+3=-3
b.-7=-2x+.3
-7-3=-2x
-10 =-2x
x=-10 : -2
=5
jadi f(5)=-2*5+3
-10+.3
=-7
x=-2
(-2.-2)+3
4+3=7
f(x)=-2x+3
x=3
(-2.3)+3
-6+3=-3
bayangan untuk-2=7 dan 3=-3