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M in (-oo:+oo)
M/4.5 = -7 // + 7
M/4.5+7 = 0
0.22222222*M+7 = 0 // - 7
0.22222222*M = -7 // : 0.22222222
M = -7/0.22222222
M = -31.50000032
M = -31.50000032
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