21=3/7x

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Solution for 21=3/7x equation: 


x in (-oo:+oo)

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

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

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

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

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

x = -21/(-3/7)

x = 49

x = 49

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