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x in (-oo:+oo)
(3/31)*x+15/31 = 9/31 // - 9/31
(3/31)*x+15/31-(9/31) = 0
(3/31)*x+15/31-9/31 = 0
3/31*x+6/31 = 0 // - 6/31
3/31*x = -6/31 // : 3/31
x = -6/31/3/31
x = -2
x = -2
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