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(2*x-6)/2-x = 3 // - 3
(2*x-6)/2-x-3 = 0
(2*x-6)/2+(2*(-x))/2+(-3*2)/2 = 0
2*x+2*(-x)-3*2-6 = 0
-6-6 = 0
-12 = 0
-12/2 = 0
-12/2 = 0 // * 2
-12 = 0
-12 = 0
x belongs to the empty set
x belongs to the empty set
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