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D( x )
2*x+1 = 0
x-7 = 0
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0 // - 1
2*x = -1 // : 2
x = -1/2
x-7 = 0
x-7 = 0
x-7 = 0 // + 7
x = 7
x in (-oo:-1/2) U (-1/2:7) U (7:+oo)
(3*x+4)/(2*x+1) = (x-12)/(x-7) // - (x-12)/(x-7)
(3*x+4)/(2*x+1)-((x-12)/(x-7)) = 0
(3*x+4)/(2*x+1)+(-1*(x-12))/(x-7) = 0
((3*x+4)*(x-7))/((2*x+1)*(x-7))+(-1*(x-12)*(2*x+1))/((2*x+1)*(x-7)) = 0
(3*x+4)*(x-7)-1*(x-12)*(2*x+1) = 0
x^2+6*x-16 = 0
x^2+6*x-16 = 0
x^2+6*x-16 = 0
DELTA = 6^2-(-16*1*4)
DELTA = 100
DELTA > 0
x = (100^(1/2)-6)/(1*2) or x = (-100^(1/2)-6)/(1*2)
x = 2 or x = -8
(x+8)*(x-2) = 0
((x+8)*(x-2))/((2*x+1)*(x-7)) = 0
((x+8)*(x-2))/((2*x+1)*(x-7)) = 0 // * (2*x+1)*(x-7)
(x+8)*(x-2) = 0
( x+8 )
x+8 = 0 // - 8
x = -8
( x-2 )
x-2 = 0 // + 2
x = 2
x in { -8, 2 }
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