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x in (-oo:+oo)
(2*x^2-(6*x))/1.25 = x^2 // - x^2
(2*x^2-(6*x))/1.25-x^2 = 0
(2*x^2-6*x)/1.25-x^2 = 0
(2*x^2-6*x)/1.25+(1.25*(-x^2))/1.25 = 0
2*x^2+1.25*(-x^2)-6*x = 0
0.75*x^2-6*x = 0
0.75*x^2-6*x = 0
x*(0.75*x-6) = 0
0.75*x-6 = 0 // + 6
0.75*x = 6 // : 0.75
x = 6/0.75
x = 8
x*(x-8) = 0
(x*(x-8))/1.25 = 0
(x*(x-8))/1.25 = 0 // * 1.25
x*(x-8) = 0
( x-8 )
x-8 = 0 // + 8
x = 8
( x )
x = 0
x in { 8, 0 }
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