-21=3/7x

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Solution for -21=3/7x equation: 


x in (-oo:+oo)

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

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

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

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

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

x = 21/(-3/7)

x = -49

x = -49

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