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x in (-oo:+oo)
(2*x^2-(23*x)-12)/12 = 25 // - 25
(2*x^2-(23*x)-12)/12-25 = 0
(2*x^2-23*x-12)/12-25 = 0
(2*x^2-23*x-12)/12+(-25*12)/12 = 0
2*x^2-23*x-25*12-12 = 0
2*x^2-23*x-312 = 0
2*x^2-23*x-312 = 0
2*x^2-23*x-312 = 0
DELTA = (-23)^2-(-312*2*4)
DELTA = 3025
DELTA > 0
x = (3025^(1/2)+23)/(2*2) or x = (23-3025^(1/2))/(2*2)
x = 39/2 or x = -8
(x+8)*(x-39/2) = 0
((x+8)*(x-39/2))/12 = 0
((x+8)*(x-39/2))/12 = 0 // * 12
(x+8)*(x-39/2) = 0
( x+8 )
x+8 = 0 // - 8
x = -8
( x-39/2 )
x-39/2 = 0 // + 39/2
x = 39/2
x in { -8, 39/2 }
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