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m in (-oo:+oo)
7/10-4*m = -73/10 // + -73/10
7/10-4*m-(-73/10) = 0
7/10-4*m+73/10 = 0
8-4*m = 0 // - 8
-4*m = -8 // : -4
m = -8/(-4)
m = 2
m = 2
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