120/90=135/x

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Solution for 120/90=135/x equation: 


D( x )

x = 0

x = 0

x = 0

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

120/90 = 135/x // - 135/x

120/90-(135/x) = 0

120/90-135*x^-1 = 0

-135*x^-1 = -4/3 // : -135

x^-1 = 4/405

-1 < 0

1/(x^1) = 4/405 // * x^1

1 = 4/405*x^1 // : 4/405

405/4 = x^1

x = 405/4

x = 405/4

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