21=-7/5x

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Solution for 21=-7/5x equation: 


x in (-oo:+oo)

21 = (-7/5)*x // - (-7/5)*x

21-((-7/5)*x) = 0

(7/5)*x+21 = 0

7/5*x+21 = 0 // - 21

7/5*x = -21 // : 7/5

x = -21/7/5

x = -15

x = -15

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