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x in (-oo:+oo)
t*((s*((((3*s)/4)*(t^2-49))/2))/7)-t^2 = 0
(3/4*s*s*t*(t^2-49))/(2*7)-t^2 = 0
(3/4*s*s*t*(t^2-49))/(2*7)+(2*7*(-t^2))/(2*7) = 0
3/4*s*s*t*(t^2-49)+2*7*(-t^2) = 0
3/4*s^2*t^3-147/4*s^2*t-14*t^2 = 0
(3/4*s^2*t^3-147/4*s^2*t-14*t^2)/(2*7) = 0
(3/4*s^2*t^3-147/4*s^2*t-14*t^2)/(2*7) = 0 // * 2*7
3/4*s^2*t^3-147/4*s^2*t-14*t^2 = 0
x belongs to the empty set
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