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M in (-oo:+oo)
M/4.5 = 70 // - 70
M/4.5-70 = 0
0.22222222*M-70 = 0 // + 70
0.22222222*M = 70 // : 0.22222222
M = 70/0.22222222
M = 315.00000315
M = 315.00000315
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