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m in (-oo:+oo)
(1/7)*m+9 = 51/7 // - 51/7
(1/7)*m-(51/7)+9 = 0
(1/7)*m-51/7+9 = 0
1/7*m+12/7 = 0 // - 12/7
1/7*m = -12/7 // : 1/7
m = -12/7/1/7
m = -12
m = -12
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