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m in (-oo:+oo)
121/18 = (5/6)*m-6*m+5 // - (5/6)*m-6*m+5
121/18-(-6*m)-((5/6)*m)-5 = 0
6*m+(-5/6)*m+121/18-5 = 0
31/6*m+31/18 = 0 // - 31/18
31/6*m = -31/18 // : 31/6
m = -31/18/31/6
m = -1/3
m = -1/3
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