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m in (-oo:+oo)
-7*m-(7/9) = 245/9 // - 245/9
-7*m-(7/9)-(245/9) = 0
-7*m-7/9-245/9 = 0
-7*m-28 = 0 // + 28
-7*m = 28 // : -7
m = 28/(-7)
m = -4
m = -4
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