x/4=7/21 - solution

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Solution for x/4=7/21 equation:

x in (-oo:+oo)

x/4 = 7/21 // - 7/21

x/4-(7/21) = 0

x/4-1/3 = 0

1/4*x-1/3 = 0 // + 1/3

1/4*x = 1/3 // : 1/4

x = 1/3/1/4

x = 4/3

x = 4/3

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