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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+1/x+5 = 9/100 // - 9/100
1/x+1/x-(9/100)+5 = 0
1/x+1/x-9/100+5 = 0
2*x^-1 = -491/100 // : 2
x^-1 = -491/200
-1 < 0
1/(x^1) = -491/200 // * x^1
1 = -491/200*x^1 // : -491/200
-200/491 = x^1
x = -200/491
x = -200/491
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