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m in (-oo:+oo)
(4*m-9)/5 = 7 // - 7
(4*m-9)/5-7 = 0
(4*m-9)/5+(-7*5)/5 = 0
4*m-7*5-9 = 0
4*m-44 = 0
(4*m-44)/5 = 0
(4*m-44)/5 = 0 // * 5
4*m-44 = 0
4*m-44 = 0 // + 44
4*m = 44 // : 4
m = 44/4
m = 11
m = 11
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