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m in (-oo:+oo)
(-1/5)*m+(5/7)*m-8 = -58/7 // + -58/7
(-1/5)*m+(5/7)*m-(-58/7)-8 = 0
(-1/5)*m+(5/7)*m+58/7-8 = 0
18/35*m+2/7 = 0 // - 2/7
18/35*m = -2/7 // : 18/35
m = -2/7/18/35
m = -5/9
m = -5/9
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