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M in (-oo:+oo)
M/(-3) = 5.4 // - 5.4
M/(-3)-5.4 = 0
-1/3*M-5.4 = 0 // + 5.4
-1/3*M = 5.4 // : -1/3
M = 5.4/(-1/3)
M = -16.20000016
M = -16.20000016
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