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M in (-oo:+oo)
M/4.5 = 6.3 // - 6.3
M/4.5-6.3 = 0
0.22222222*M-6.3 = 0 // + 6.3
0.22222222*M = 6.3 // : 0.22222222
M = 6.3/0.22222222
M = 28.35000028
M = 28.35000028
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