a)
S = {1; 2}
b)
S = {1; 6}
c)
S = {2; 5}
d)
S = { }
e)
S = {-5; 5}
f)
S = {-1/2; 1/2}
g)
S = {0; 2}
h)
S = {-2; 2}
i)
S = {0; 7/6}
j)
S = {2; 6}
k)
S = {-3; -3} ou S = {-3}
l)
S = { }
m)
S = {-2; 3}
n)
S = {1/3; 3}
