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m in (-oo:+oo)
(6/7)*m+7 = -23/7 // + -23/7
(6/7)*m-(-23/7)+7 = 0
(6/7)*m+23/7+7 = 0
6/7*m+72/7 = 0 // - 72/7
6/7*m = -72/7 // : 6/7
m = -72/7/6/7
m = -12
m = -12
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