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m in (-oo:+oo)
4/7 = 18-((2/7)*m) // - 18-((2/7)*m)
(2/7)*m+4/7-18 = 0
2/7*m-122/7 = 0 // + 122/7
2/7*m = 122/7 // : 2/7
m = 122/7/2/7
m = 61
m = 61
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