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m in (-oo:+oo)
-7*m = -21/5 // + -21/5
-7*m-(-21/5) = 0
21/5-7*m = 0
21/5-7*m = 0 // - 21/5
-7*m = -21/5 // : -7
m = -21/5/(-7)
m = 3/5
m = 3/5
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