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m in (-oo:+oo)
(4/7)*m = 18-((2/7)*m) // - 18-((2/7)*m)
(4/7)*m+(2/7)*m-18 = 0
6/7*m-18 = 0 // + 18
6/7*m = 18 // : 6/7
m = 18/6/7
m = 21
m = 21
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