21/8=105/x

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Solution for 21/8=105/x equation: 


D( x )

x = 0

x = 0

x = 0

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

21/8 = 105/x // - 105/x

21/8-(105/x) = 0

21/8-105*x^-1 = 0

-105*x^-1 = -21/8 // : -105

x^-1 = 1/40

-1 < 0

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

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

40 = x^1

x = 40

x = 40

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