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m in (-oo:+oo)
7-((5/7)*m) = (1/6)*m+845/126 // - (1/6)*m+845/126
7-((5/7)*m)-((1/6)*m)-(845/126) = 0
(-5/7)*m+(-1/6)*m-845/126+7 = 0
37/126-37/42*m = 0 // - 37/126
-37/42*m = -37/126 // : -37/42
m = -37/126/(-37/42)
m = 1/3
m = 1/3
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