9/10=12/x-3

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Solution for 9/10=12/x-3 equation: 


D( x )

x = 0

x = 0

x = 0

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

9/10 = 12/x-3 // - 12/x-3

9/10-(12/x)+3 = 0

9/10-12*x^-1+3 = 0

-12*x^-1 = -39/10 // : -12

x^-1 = 13/40

-1 < 0

1/(x^1) = 13/40 // * x^1

1 = 13/40*x^1 // : 13/40

40/13 = x^1

x = 40/13

x = 40/13

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