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m in (-oo:+oo)
(2/7)*m+1 = -15/7 // + -15/7
(2/7)*m-(-15/7)+1 = 0
(2/7)*m+15/7+1 = 0
2/7*m+22/7 = 0 // - 22/7
2/7*m = -22/7 // : 2/7
m = -22/7/2/7
m = -11
m = -11
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