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D( x )
4*x+3 = 0
4*x+3 = 0
4*x+3 = 0
4*x+3 = 0 // - 3
4*x = -3 // : 4
x = -3/4
x in (-oo:-3/4) U (-3/4:+oo)
2/(4*x+3) = 7 // - 7
2/(4*x+3)-7 = 0
2/(4*x+3)+(-7*(4*x+3))/(4*x+3) = 0
2-7*(4*x+3) = 0
-28*x-19 = 0
(-28*x-19)/(4*x+3) = 0
(-28*x-19)/(4*x+3) = 0 // * 4*x+3
-28*x-19 = 0
-28*x-19 = 0 // + 19
-28*x = 19 // : -28
x = 19/(-28)
x = -19/28
x = -19/28
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