7|x-5|=21 /:7
|x-5|=3
x-5=3 ∨ x-5=-3
x=8 ∨ x=2
Z={2,8}
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7|x-5|=21 /:7
|x-5|=3
x-5=3 ∨ x-5=-3
x=8 ∨ x=2
Z={2,8}