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m in (-oo:+oo)
(-1/5)*m+7/8 = -m-317/40 // + -m-317/40
(-1/5)*m+m+7/8-(-317/40) = 0
(-1/5)*m+m+7/8+317/40 = 0
4/5*m+44/5 = 0 // - 44/5
4/5*m = -44/5 // : 4/5
m = -44/5/4/5
m = -11
m = -11
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