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x in (-oo:+oo)
(x+3609)/12 = 320 // - 320
(x+3609)/12-320 = 0
(x+3609)/12+(-320*12)/12 = 0
x-320*12+3609 = 0
x-231 = 0
(x-231)/12 = 0
(x-231)/12 = 0 // * 12
x-231 = 0
x-231 = 0 // + 231
x = 231
x = 231
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