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m in (-oo:+oo)
8-4*m-((3/7)*m) = -23 // + 23
8-4*m-((3/7)*m)+23 = 0
(-3/7)*m-4*m+8+23 = 0
31-31/7*m = 0 // - 31
-31/7*m = -31 // : -31/7
m = -31/(-31/7)
m = 7
m = 7
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