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x in (-oo:+oo)
x/15-x = 5/20 // - 5/20
x/15-x-(5/20) = 0
x/15-x-1/4 = 0
-14/15*x-1/4 = 0 // + 1/4
-14/15*x = 1/4 // : -14/15
x = 1/4/(-14/15)
x = -15/56
x = -15/56
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