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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)
2/10 = (x-10)/(x+7) // - (x-10)/(x+7)
2/10-((x-10)/(x+7)) = 0
(-1*(x-10))/(x+7)+1/5 = 0
(-1*5*(x-10))/(5*(x+7))+(1*(x+7))/(5*(x+7)) = 0
1*(x+7)-1*5*(x-10) = 0
57-4*x = 0
(57-4*x)/(5*(x+7)) = 0
(57-4*x)/(5*(x+7)) = 0 // * 5*(x+7)
57-4*x = 0
57-4*x = 0 // - 57
-4*x = -57 // : -4
x = -57/(-4)
x = 57/4
x = 57/4
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