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M in (-oo:+oo)
(5/8)*M = 6.75 // - 6.75
(5/8)*M-6.75 = 0
5/8*M-6.75 = 0 // + 6.75
5/8*M = 6.75 // : 5/8
M = 6.75/5/8
M = 10.8
M = 10.8
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