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x in (-oo:+oo)
(1/2)*(10*x-9) = 5*x // - 5*x
(1/2)*(10*x-9)-(5*x) = 0
(1/2)*(10*x-9)-5*x = 0
1/2*(10*x-9)-5*x = 0
1/2*(10*x-9)-5*x = 0
-9/2 = 0
-9/2 = 0
-9/2 = 0 // * 2
-9 = 0
-9 = 0
x belongs to the empty set
x belongs to the empty set
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