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b) x∈{14,21,28,35,42,49,56,63,70,77,84,91,98}
c) x∈{5,6,7,8,9,10,11}
d)
2x-5=1
2x=6
x=3
x∈{3}
e) x∈{1/8, 3/8, 5/8, 7/8}