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x in (-oo:+oo)
-2/5 = (3/8)*x // - (3/8)*x
-((3/8)*x)-2/5 = 0
(-3/8)*x-2/5 = 0
-3/8*x-2/5 = 0 // + 2/5
-3/8*x = 2/5 // : -3/8
x = 2/5/(-3/8)
x = -16/15
x = -16/15
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