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m in (-oo:+oo)
1/8-(7*m) = 4*m-(85/24) // - 4*m-(85/24)
1/8-(7*m)-(4*m)+85/24 = 0
1/8-7*m-4*m+85/24 = 0
11/3-11*m = 0 // - 11/3
-11*m = -11/3 // : -11
m = -11/3/(-11)
m = 1/3
m = 1/3
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