21=-7/3x

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Solution for 21=-7/3x equation: 


x in (-oo:+oo)

21 = (-7/3)*x // - (-7/3)*x

21-((-7/3)*x) = 0

(7/3)*x+21 = 0

7/3*x+21 = 0 // - 21

7/3*x = -21 // : 7/3

x = -21/7/3

x = -9

x = -9

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