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