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x in (-oo:+oo)
(((a^1)/2-(31/2))/(5^1))/2 = 4*b // - 4*b
(((a^1)/2-(31/2))/(5^1))/2-(4*b) = 0
((a/2-31/2)/5)/2-4*b = 0
(1/2*a-31/2)/(2*5)-4*b = 0
(1/2*a-31/2)/(2*5)+(-4*2*5*b)/(2*5) = 0
1/2*a-4*2*5*b-31/2 = 0
1/2*a-40*b-31/2 = 0
(1/2*a-40*b-31/2)/(2*5) = 0
(1/2*a-40*b-31/2)/(2*5) = 0 // * 2*5
1/2*a-40*b-31/2 = 0
x belongs to the empty set
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