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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/x+484/49 = 0
12*x^-1 = -484/49 // : 12
x^-1 = -121/147
-1 < 0
1/(x^1) = -121/147 // * x^1
1 = -121/147*x^1 // : -121/147
-147/121 = x^1
x = -147/121
x = -147/121
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