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x in (-oo:+oo)
(2/5)*x+3 = 2*x-5 // - 2*x-5
(2/5)*x-(2*x)+3+5 = 0
(2/5)*x-2*x+3+5 = 0
8-8/5*x = 0 // - 8
-8/5*x = -8 // : -8/5
x = -8/(-8/5)
x = 5
x = 5
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