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D( x )
2*x-7 = 0
x+10 = 0
2*x-7 = 0
2*x-7 = 0
2*x-7 = 0 // + 7
2*x = 7 // : 2
x = 7/2
x+10 = 0
x+10 = 0
x+10 = 0 // - 10
x = -10
x in (-oo:-10) U (-10:7/2) U (7/2:+oo)
8/(x+10) = 4/(2*x-7) // - 4/(2*x-7)
8/(x+10)-(4/(2*x-7)) = 0
8/(x+10)-4*(2*x-7)^-1 = 0
8/(x+10)-4/(2*x-7) = 0
(8*(2*x-7))/((x+10)*(2*x-7))+(-4*(x+10))/((x+10)*(2*x-7)) = 0
8*(2*x-7)-4*(x+10) = 0
12*x-96 = 0
(12*x-96)/((x+10)*(2*x-7)) = 0
(12*x-96)/((x+10)*(2*x-7)) = 0 // * (x+10)*(2*x-7)
12*x-96 = 0
12*x-96 = 0 // + 96
12*x = 96 // : 12
x = 96/12
x = 8
x = 8
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