p/3-p/7=4 - solution

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Solution for p/3-p/7=4 equation:

p in (-oo:+oo)

p/3-(p/7) = 4 // - 4

p/3-(p/7)-4 = 0

4/21*p-4 = 0 // + 4

4/21*p = 4 // : 4/21

p = 4/4/21

p = 21

p = 21

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