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x in (-oo:+oo)
(s+7)/2 = t+1 // - t+1
(s+7)/2-t-1 = 0
(s+7)/2+(2*(-t))/2+(-1*2)/2 = 0
s+2*(-t)-1*2+7 = 0
s-2*t-2+7 = 0
s-2*t+5 = 0
(s-2*t+5)/2 = 0
(s-2*t+5)/2 = 0 // * 2
s-2*t+5 = 0
x belongs to the empty set
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