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x in (-oo:+oo)
(31/10)*x = 61/5 // - 61/5
(31/10)*x-(61/5) = 0
(31/10)*x-61/5 = 0
31/10*x-61/5 = 0 // + 61/5
31/10*x = 61/5 // : 31/10
x = 61/5/31/10
x = 122/31
x = 122/31
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