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m in (-oo:+oo)
7*m-((4/7)*m)-3/5 = 894/385 // - 894/385
7*m-((4/7)*m)-3/5-(894/385) = 0
7*m+(-4/7)*m-3/5-894/385 = 0
45/7*m-225/77 = 0 // + 225/77
45/7*m = 225/77 // : 45/7
m = 225/77/45/7
m = 5/11
m = 5/11
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