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x in (-oo:+oo)
5 = (4/5)*x // - (4/5)*x
5-((4/5)*x) = 0
(-4/5)*x+5 = 0
5-4/5*x = 0 // - 5
-4/5*x = -5 // : -4/5
x = -5/(-4/5)
x = 25/4
x = 25/4
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