You should be able to look at this equation, or use the discriminant and know that there are no real roots.
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7x+5-14 = 28 7x = 28+14-5 7x = 37 x = 37/7 = 5.'285714' recurring
-7x + 5 = -9 -7x = -14 7x = 14 x = 2
7x+17 = 45 7x = 45-17 7x = 28 x = 4
7x + 9 = 51 7x = 42 x = 42/7 = 6
the empty set.