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