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m in (-oo:+oo)
(5/7)*m+(3/7)*m-1 = -9 // + 9
(5/7)*m+(3/7)*m-1+9 = 0
8/7*m+8 = 0 // - 8
8/7*m = -8 // : 8/7
m = -8/8/7
m = -7
m = -7
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