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M in (-oo:+oo)
M/21.45 = 6 // - 6
M/21.45-6 = 0
0.04662005*M-6 = 0 // + 6
0.04662005*M = 6 // : 0.04662005
M = 6/0.04662005
M = 128.69999067
M = 128.69999067
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