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x in (-oo:+oo)
(13/15)*x = 13/36 // - 13/36
(13/15)*x-(13/36) = 0
(13/15)*x-13/36 = 0
13/15*x-13/36 = 0 // + 13/36
13/15*x = 13/36 // : 13/15
x = 13/36/13/15
x = 5/12
x = 5/12
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