3+z/3=21 - solution

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Solution for 3+z/3=21 equation:

z in (-oo:+oo)

z/3+3 = 21 // - 21

z/3-21+3 = 0

1/3*z-18 = 0 // + 18

1/3*z = 18 // : 1/3

z = 18/1/3

z = 54

z = 54

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