R/-321

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Solution for R/-321 equation: 


R in (-oo:+oo)

R/(-3) < 21 // - 21

R/(-3)-21 < 0

-1/3*R-21 < 0 // + 21

-1/3*R < 21 // : -1/3

R > 21/(-1/3)

R > -63

R in (-63:+oo)

(-63:+oo)

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