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m in (-oo:+oo)
(3/4)*m+7 = 77/12 // - 77/12
(3/4)*m-(77/12)+7 = 0
(3/4)*m-77/12+7 = 0
3/4*m+7/12 = 0 // - 7/12
3/4*m = -7/12 // : 3/4
m = -7/12/3/4
m = -7/9
m = -7/9
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