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x in (-oo:+oo)
3*(a+2*b) = 5*a+b/4 // - 5*a+b/4
3*(a+2*b)-(5*a)-(b/4) = 0
3*(a+2*b)-5*a-(b/4) = 0
3*(a+2*b)-5*a-b/4 = 0
(3*4*(a+2*b))/4+(-5*4*a)/4-b/4 = 0
3*4*(a+2*b)-5*4*a-b = 0
24*b-8*a-b = 0
23*b-8*a = 0
(23*b-8*a)/4 = 0
(23*b-8*a)/4 = 0 // * 4
23*b-8*a = 0
x belongs to the empty set
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