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