-x=21/30 - solution

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Solution for -x=21/30 equation:

x in (-oo:+oo)

-x = 21/30 // - 21/30

-x-(21/30) = 0

-x-7/10 = 0

-x-7/10 = 0 // + 7/10

-x = 7/10 // * -1

x = -7/10

x = -7/10

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