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D( x )
2*x+3 = 0
2*x+3 = 0
2*x+3 = 0
2*x+3 = 0 // - 3
2*x = -3 // : 2
x = -3/2
x in (-oo:-3/2) U (-3/2:+oo)
14/(2*x+3) = 7 // - 7
14/(2*x+3)-7 = 0
14/(2*x+3)+(-7*(2*x+3))/(2*x+3) = 0
14-7*(2*x+3) = 0
-14*x-7 = 0
(-14*x-7)/(2*x+3) = 0
(-14*x-7)/(2*x+3) = 0 // * 2*x+3
-14*x-7 = 0
-14*x-7 = 0 // + 7
-14*x = 7 // : -14
x = 7/(-14)
x = -1/2
x = -1/2
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