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x in (-oo:+oo)
(1*x)/21-y = n // - n
(1*x)/21-n-y = 0
x/21-n-y = 0
1/21*x-n-y = 0 // + -n-y
1/21*x = -(-n-y) // : 1/21
x = (-(-n-y))/1/21
x = 21*(n+y)
x = 21*(n+y)
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