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m in (-oo:+oo)
(2/7)*m+4 = -7 // + 7
(2/7)*m+4+7 = 0
2/7*m+11 = 0 // - 11
2/7*m = -11 // : 2/7
m = -11/2/7
m = -77/2
m = -77/2
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