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x in (-oo:+oo)
2/5-(4*x) = 5*x+47/5 // - 5*x+47/5
2/5-(4*x)-(5*x)-(47/5) = 0
2/5-4*x-5*x-47/5 = 0
-9*x-9 = 0 // + 9
-9*x = 9 // : -9
x = 9/(-9)
x = -1
x = -1
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