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D( x )
9*x+10 = 0
9*x+10 = 0
9*x+10 = 0
9*x+10 = 0 // - 10
9*x = -10 // : 9
x = -10/9
x in (-oo:-10/9) U (-10/9:+oo)
(7*x+5)/(9*x+10) = 3/4 // - 3/4
(7*x+5)/(9*x+10)-(3/4) = 0
(7*x+5)/(9*x+10)-3/4 = 0
(4*(7*x+5))/(4*(9*x+10))+(-3*(9*x+10))/(4*(9*x+10)) = 0
4*(7*x+5)-3*(9*x+10) = 0
x-10 = 0
(x-10)/(4*(9*x+10)) = 0
(x-10)/(4*(9*x+10)) = 0 // * 4*(9*x+10)
x-10 = 0
x-10 = 0 // + 10
x = 10
x = 10
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