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x in (-oo:+oo)
4*x+13 = (1/2)*(8*x+26) // - (1/2)*(8*x+26)
4*x-((1/2)*(8*x+26))+13 = 0
(-1/2)*(8*x+26)+4*x+13 = 0
4*x-1/2*(8*x+26)+13 = 0
4*x-1/2*(8*x+26)+13 = 0
13-13 = 0
0 = 0
0 = 0
x belongs to the empty set
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