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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*(-13/(4*x+5))*((16*x^2-25)/10) = 0
(-13*x*(16*x^2-25))/(10*(4*x+5)) = 0
( 16*x^2-25 )
16*x^2 = 25 // : 16
x^2 = 25/16
x^2 = 25/16 // ^ 1/2
abs(x) = 5/4
x = 5/4 or x = -5/4
( x )
x = 0
x in { -5/4}
x in { 5/4, 0 }
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