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m in (-oo:+oo)
2/5-(5*m)-((6/7)*m) = -93/280 // + -93/280
2/5-(5*m)-((6/7)*m)-(-93/280) = 0
(-6/7)*m-5*m+2/5+93/280 = 0
41/56-41/7*m = 0 // - 41/56
-41/7*m = -41/56 // : -41/7
m = -41/56/(-41/7)
m = 1/8
m = 1/8
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