21=x/3

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Solution for 21=x/3 equation: 


x in (-oo:+oo)

21 = x/3 // - x/3

21-(x/3) = 0

21-1/3*x = 0 // - 21

-1/3*x = -21 // : -1/3

x = -21/(-1/3)

x = 63

x = 63

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