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M in (-oo:+oo)
7*(2/3) = 2*M // - 2*M
7*(2/3)-(2*M) = 0
7*(2/3)-2*M = 0
14/3-2*M = 0 // - 14/3
-2*M = -14/3 // : -2
M = -14/3/(-2)
M = 7/3
M = 7/3
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