7=1050/(X/40)

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Solution for 7=1050/(X/40) equation: 


D( X )

X/40 = 0

X/40 = 0

X/40 = 0

1/40*X = 0 // : 1/40

X = 0

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

7 = 1050/(X/40) // - 1050/(X/40)

7-(1050/(X/40)) = 0

7-42000*X^-1 = 0

-42000*X^-1 = -7 // : -42000

X^-1 = 1/6000

-1 < 0

1/(X^1) = 1/6000 // * X^1

1 = 1/6000*X^1 // : 1/6000

6000 = X^1

X = 6000

X = 6000

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