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M in (-oo:+oo)
M/4 = 1.5/5 // - 1.5/5
M/4-(1.5/5) = 0
M/4-0.3 = 0
1/4*M-0.3 = 0 // + 0.3
1/4*M = 0.3 // : 1/4
M = 0.3/1/4
M = 1.2
M = 1.2
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