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x in (-oo:+oo)
15/12 = (10/2)*x // - (10/2)*x
15/12-((10/2)*x) = 0
15/12-5*x = 0
5/4-5*x = 0 // - 5/4
-5*x = -5/4 // : -5
x = -5/4/(-5)
x = 1/4
x = 1/4
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