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x in (-oo:+oo)
-12/5 = 6*x // - 6*x
-(6*x)-12/5 = 0
-6*x-12/5 = 0
-6*x-12/5 = 0 // + 12/5
-6*x = 12/5 // : -6
x = 12/5/(-6)
x = -2/5
x = -2/5
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