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y in (-oo:+oo)
(6*y-7)/2+8/4 = (12*y+9)/4 // - (12*y+9)/4
(6*y-7)/2-((12*y+9)/4)+8/4 = 0
(6*y-7)/2+(-1*(12*y+9))/4+2 = 0
(4*(6*y-7))/(2*4)+(-1*2*(12*y+9))/(2*4)+(4*2^2)/(2*4) = 0
4*(6*y-7)-1*2*(12*y+9)+4*2^2 = 0
16-46 = 0
-30 = 0
-30/(2*4) = 0
-30/(2*4) = 0 // * 2*4
-30 = 0
y belongs to the empty set
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