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m in (-oo:+oo)
-7*m-7 = -14/3 // + -14/3
-7*m-(-14/3)-7 = 0
14/3-7*m-7 = 0
-7*m-7/3 = 0 // + 7/3
-7*m = 7/3 // : -7
m = 7/3/(-7)
m = -1/3
m = -1/3
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