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x in (-oo:+oo)
(21/2)*x = 221/2 // - 221/2
(21/2)*x-(221/2) = 0
(21/2)*x-221/2 = 0
21/2*x-221/2 = 0 // + 221/2
21/2*x = 221/2 // : 21/2
x = 221/2/21/2
x = 221/21
x = 221/21
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