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m in (-oo:+oo)
2-7*m = -53/12 // + -53/12
2-7*m-(-53/12) = 0
53/12-7*m+2 = 0
77/12-7*m = 0 // - 77/12
-7*m = -77/12 // : -7
m = -77/12/(-7)
m = 11/12
m = 11/12
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