M/7-M/3=4 - solution

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

M in (-oo:+oo)

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

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

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

-4/21*M = 4 // : -4/21

M = 4/(-4/21)

M = -21

M = -21

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