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D=R\{7}
2x=0
m.z. x=0
b)
D=R\{-9}
x+3=0
m.z. x=-3
c)
D=R\{1/5}
9x-9=0
9x=9
m.z. x=1
d)
D=R\{-1/9}
1-3x=0
3x=1
m.z. x=1/3
e)
D=R\{-4}
2x+8=0
dla x=-4∉D
nie ma m.z.
f)
D=R\{2}
x-2=0 dla x=2∉D
nie ma m.z.
g)
D=R
4x-1=0
4x=1
m.z. x=1/4
h)
D=R
3x-4=0
3x=4
m.z. x=4/3