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x in (-oo:+oo)
4-((4/5)*x) = 5 // - 5
4-((4/5)*x)-5 = 0
(-4/5)*x-5+4 = 0
-4/5*x-1 = 0 // + 1
-4/5*x = 1 // : -4/5
x = 1/(-4/5)
x = -5/4
x = -5/4
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