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x in (-oo:+oo)
3/(-2) = (4/5)*x // - (4/5)*x
3/(-2)-((4/5)*x) = 0
(-4/5)*x+3/(-2) = 0
-4/5*x-3/2 = 0 // + 3/2
-4/5*x = 3/2 // : -4/5
x = 3/2/(-4/5)
x = -15/8
x = -15/8
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