(252/X+7)+(252/X)=21

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Solution for (252/X+7)+(252/X)=21 equation: 


D( X )

X = 0

X = 0

X = 0

X in (-oo:0) U (0:+oo)

252/X+252/X+7 = 21 // - 21

252/X+252/X-21+7 = 0

504*X^-1 = 14 // : 504

X^-1 = 1/36

-1 < 0

1/(X^1) = 1/36 // * X^1

1 = 1/36*X^1 // : 1/36

36 = X^1

X = 36

X = 36

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