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m in (-oo:+oo)
-3 = m/7-2 // - m/7-2
2-(m/7)-3 = 0
-1/7*m-1 = 0 // + 1
-1/7*m = 1 // : -1/7
m = 1/(-1/7)
m = -7
m = -7
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