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x in (-oo:+oo)
(3/31)*x+9/31 = 12/31 // - 12/31
(3/31)*x+9/31-(12/31) = 0
(3/31)*x+9/31-12/31 = 0
3/31*x-3/31 = 0 // + 3/31
3/31*x = 3/31 // : 3/31
x = 3/31/3/31
x = 1
x = 1
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