x/3=4x/21 - solution

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Solution for x/3=4x/21 equation:

x in (-oo:+oo)

x/3 = (4*x)/21 // - (4*x)/21

x/3-((4*x)/21) = 0

x/3+(-4/21)*x = 0

1/7*x = 0 // : 1/7

x = 0

x = 0

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