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b) f(-3)= 8/5-(3)=1
c) f(7) = 8/5-7=-4
d) f(x) =8/5-x=2
8=2(5-x
8=10-2x
2x=10-8
X=2/2=1
e) f(a) = 8/5-a=0,5
8=0,5(5-x)
8=2,5-0,5x
0,5x=2,5-8
X=5.5/0.5
X=11