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a < 1/2
a ∈ (-∞;1/2)
5b < -10 / : 5
b < - 10/5
b < -2
b ∈ (-∞; -2)
-c ≤ 7 / * (-1)
c ≥ -7
c ∈ <-7;+∞)
-d ≥ -4 / * (-1)
d ≤ 4
d ∈ (-∞;4>
-3e > 9 / : (-3)
e < -3
e ∈ (-∞;-3)
-1/2f < 4 / : (-1/2)
f > 4:(-1/2)
f > 4*(-2/1)
f > -8
f ∈ (-8;+∞)
5b < -10 => b < -2
-c ≤ -7 => c ≥ 7
-d ≥ - 4 => d ≤ 4
-3c > 9 => c < - 3
- (1/2)f < 4 => f > -8