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D( x )
2*(x+3) = 0
x+3 = 0
2*(x+3) = 0
2*(x+3) = 0
x+3 = 0 // - 3
x = -3
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:+oo)
(6*x+7)/(2*(x+3))-((2*x+5)/(2*(x+3))) = (2*(2*x+3))/(x+3) // - (2*(2*x+3))/(x+3)
(6*x+7)/(2*(x+3))-((2*x+5)/(2*(x+3)))-((2*(2*x+3))/(x+3)) = 0
(6*x+7)/(2*(x+3))-((2*x+5)/(2*(x+3)))-2*(2*x+3)*(x+3)^-1 = 0
(6*x+7)/(2*(x+3))+(-1*(2*x+5))/(2*(x+3))+(-2*(2*x+3))/(x+3) = 0
(6*x+7)/(2*(x+3))+(-1*(2*x+5))/(2*(x+3))+(-2*2*(2*x+3))/(2*(x+3)) = 0
6*x-1*(2*x+5)-2*2*(2*x+3)+7 = 0
4*x-8*x-12+2 = 0
-4*x-10 = 0
(-4*x-10)/(2*(x+3)) = 0
(-4*x-10)/(2*(x+3)) = 0 // * 2*(x+3)
-4*x-10 = 0
-4*x-10 = 0 // + 10
-4*x = 10 // : -4
x = 10/(-4)
x = -5/2
x = -5/2
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