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D( x )
x+7 = 0
x+7 = 0
x+7 = 0
x+7 = 0 // - 7
x = -7
x in (-oo:-7) U (-7:+oo)
(x-10)/(x+7) = -6/10 // + -6/10
(x-10)/(x+7)-(-6/10) = 0
(x-10)/(x+7)+3/5 = 0
(5*(x-10))/(5*(x+7))+(3*(x+7))/(5*(x+7)) = 0
5*(x-10)+3*(x+7) = 0
8*x-29 = 0
(8*x-29)/(5*(x+7)) = 0
(8*x-29)/(5*(x+7)) = 0 // * 5*(x+7)
8*x-29 = 0
8*x-29 = 0 // + 29
8*x = 29 // : 8
x = 29/8
x = 29/8
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