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m in (-oo:+oo)
(3/7)*m+(2/7)*m-5 = -405/77 // + -405/77
(3/7)*m+(2/7)*m-(-405/77)-5 = 0
(3/7)*m+(2/7)*m+405/77-5 = 0
5/7*m+20/77 = 0 // - 20/77
5/7*m = -20/77 // : 5/7
m = -20/77/5/7
m = -4/11
m = -4/11
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