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m in (-oo:+oo)
-((2/7)*m)-4/5 = -128/35 // + -128/35
-((2/7)*m)-4/5-(-128/35) = 0
(-2/7)*m-4/5+128/35 = 0
20/7-2/7*m = 0 // - 20/7
-2/7*m = -20/7 // : -2/7
m = -20/7/(-2/7)
m = 10
m = 10
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