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x in (-oo:+oo)
8-(2*x) = (1/2)*(12-(4*x)) // - (1/2)*(12-(4*x))
8-((1/2)*(12-(4*x)))-(2*x) = 0
(-1/2)*(12-4*x)-2*x+8 = 0
8-1/2*(12-4*x)-2*x = 0
8-1/2*(12-4*x)-2*x = 0
8-6 = 0
2 = 0
2 = 0
x belongs to the empty set
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