7/10=15/-x

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Solution for 7/10=15/-x equation: 


D( x )

-x = 0

-x = 0

x = 0

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

7/10 = 15/(-x) // - 15/(-x)

7/10-(15/(-x)) = 0

15*x^-1+7/10 = 0

15*x^-1 = -7/10 // : 15

x^-1 = -7/150

-1 < 0

1/(x^1) = -7/150 // * x^1

1 = -7/150*x^1 // : -7/150

-150/7 = x^1

x = -150/7

x = -150/7

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