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m in (-oo:+oo)
(1/7)*m-9 = -71/7 // + -71/7
(1/7)*m-(-71/7)-9 = 0
(1/7)*m+71/7-9 = 0
1/7*m+8/7 = 0 // - 8/7
1/7*m = -8/7 // : 1/7
m = -8/7/1/7
m = -8
m = -8
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