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x in (-oo:+oo)
(3/5)*x-x = 2*x-8 // - 2*x-8
(3/5)*x-x-(2*x)+8 = 0
(3/5)*x-x-2*x+8 = 0
8-12/5*x = 0 // - 8
-12/5*x = -8 // : -12/5
x = -8/(-12/5)
x = 10/3
x = 10/3
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