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x in (-oo:+oo)
Y-7 = (1/4)*(y+2) // - (1/4)*(y+2)
Y-((1/4)*(y+2))-7 = 0
(-1/4)*(y+2)+Y-7 = 0
Y-1/4*(y+2)-7 = 0
Y-1/4*(y+2)-7 = 0
Y-1/4*y-7-1/2 = 0
Y-1/4*y-15/2 = 0
Y-1/4*y-15/2 = 0
x belongs to the empty set
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