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D( x )
4*x+5 = 0
4*x+5 = 0
4*x+5 = 0
4*x+5 = 0 // - 5
4*x = -5 // : 4
x = -5/4
x in (-oo:-5/4) U (-5/4:+oo)
x/(4*x+5) = 4 // - 4
x/(4*x+5)-4 = 0
x/(4*x+5)+(-4*(4*x+5))/(4*x+5) = 0
x-4*(4*x+5) = 0
-15*x-20 = 0
(-15*x-20)/(4*x+5) = 0
(-15*x-20)/(4*x+5) = 0 // * 4*x+5
-15*x-20 = 0
-15*x-20 = 0 // + 20
-15*x = 20 // : -15
x = 20/(-15)
x = -4/3
x = -4/3
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