X/3-X/7=12 - solution

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Solution for X/3-X/7=12 equation:

X in (-oo:+oo)

X/3-(X/7) = 12 // - 12

X/3-(X/7)-12 = 0

4/21*X-12 = 0 // + 12

4/21*X = 12 // : 4/21

X = 12/4/21

X = 63

X = 63

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