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x in (-oo:+oo)
(((1/4)*x^1)/5)*(x-3) = 5*x // - 5*x
(((1/4)*x^1)/5)*(x-3)-(5*x) = 0
(((1/4)*x)/5)*(x-3)-5*x = 0
1/20*x*(x-3)-5*x = 0
1/20*x*(x-3)-5*x = 0
1/20*x^2-103/20*x = 0
1/20*x^2-103/20*x = 0
1/20*x*(x-103) = 0
x-103 = 0 // + 103
x = 103
1/20*x*(x-103) = 0
1/20*x*(x-103) = 0
( 1/20*x )
1/20*x = 0 // : 1/20
x = 0
( x-103 )
x-103 = 0 // + 103
x = 103
x in { 0, 103 }
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