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x in (-oo:+oo)
(x+5)/30 = 12 // - 12
(x+5)/30-12 = 0
(x+5)/30+(-12*30)/30 = 0
x-12*30+5 = 0
x-355 = 0
(x-355)/30 = 0
(x-355)/30 = 0 // * 30
x-355 = 0
x-355 = 0 // + 355
x = 355
x = 355
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