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x in (-oo:+oo)
(-4/5)*x = 5*x-(1/5) // - 5*x-(1/5)
(-4/5)*x-(5*x)+1/5 = 0
(-4/5)*x-5*x+1/5 = 0
1/5-29/5*x = 0 // - 1/5
-29/5*x = -1/5 // : -29/5
x = -1/5/(-29/5)
x = 1/29
x = 1/29
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