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m in (-oo:+oo)
(3/4)*m = 8.25 // - 8.25
(3/4)*m-8.25 = 0
3/4*m-8.25 = 0 // + 8.25
3/4*m = 8.25 // : 3/4
m = 8.25/3/4
m = 11
m = 11
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