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m in (-oo:+oo)
7/3-(4*m) = -2 // + 2
7/3-(4*m)+2 = 0
7/3-4*m+2 = 0
13/3-4*m = 0 // - 13/3
-4*m = -13/3 // : -4
m = -13/3/(-4)
m = 13/12
m = 13/12
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