21/3=3x/3 - solution

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Solution for 21/3=3x/3 equation:

x in (-oo:+oo)

21/3 = (3*x)/3 // - (3*x)/3

21/3-((3*x)/3) = 0

21/3-x = 0

7-x = 0 // - 7

-x = -7 // * -1

x = 7

x = 7

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