21=1/15*x

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Solution for 21=1/15*x equation: 


x in (-oo:+oo)

21 = (1/15)*x // - (1/15)*x

21-((1/15)*x) = 0

(-1/15)*x+21 = 0

21-1/15*x = 0 // - 21

-1/15*x = -21 // : -1/15

x = -21/(-1/15)

x = 315

x = 315

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