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x-3x²≠0
x(1-3x)≠0
x≠0 ∧ x≠1/3
D=R \ {0 , 1/3}
b)
7-4x≥0
-4x ≥ -7
x ≤ 7/4
x≤ 1,75
D=(-∞, 1,75>
c)
3x+2≥0 ∧ x≠4
3x ≥ -2
x≥ -2/3
D=<-2/3 , 4) u (4, +∞)