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x in (-oo:+oo)
-6/15 = x/10 // - x/10
-(x/10)-6/15 = 0
-1/10*x-2/5 = 0 // + 2/5
-1/10*x = 2/5 // : -1/10
x = 2/5/(-1/10)
x = -4
x = -4
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