21=x/3+3 - solution

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Solution for 21=x/3+3 equation:

x in (-oo:+oo)

21 = x/3+3 // - x/3+3

21-(x/3)-3 = 0

18-1/3*x = 0 // - 18

-1/3*x = -18 // : -1/3

x = -18/(-1/3)

x = 54

x = 54

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