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m in (-oo:+oo)
(5/7)*m+2*m+1 = -125/84 // + -125/84
(5/7)*m+2*m-(-125/84)+1 = 0
(5/7)*m+2*m+125/84+1 = 0
19/7*m+209/84 = 0 // - 209/84
19/7*m = -209/84 // : 19/7
m = -209/84/19/7
m = -11/12
m = -11/12
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