13/21=-4/21x

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Solution for 13/21=-4/21x equation: 


x in (-oo:+oo)

13/21 = (-4/21)*x // - (-4/21)*x

13/21-((-4/21)*x) = 0

(4/21)*x+13/21 = 0

4/21*x+13/21 = 0 // - 13/21

4/21*x = -13/21 // : 4/21

x = -13/21/4/21

x = -13/4

x = -13/4

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