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x≠2 D=R/{0,2}
b) x+3≠0 ∧ 5-x≠0
x≠ -3 ∧x≠ 5 D=R/{-3,5}
c) 4x+3≠0 ∧ 6 -x≠0
4x≠ -3 ∧-x ≠ -6
x≠ -3/4 ∧ x≠ 6 D= R/{ -3/4, 6}
d) 8x -6≠0 ∧ x+1≠0
8x≠6 ∧x≠ -1
x≠6/8
x≠ 3/4 D=R/ { -1, 3/4}