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m in (-oo:+oo)
8-(m/3) = 3*m-4 // - 3*m-4
4-(m/3)-(3*m)+8 = 0
4-(m/3)-3*m+8 = 0
12-10/3*m = 0 // - 12
-10/3*m = -12 // : -10/3
m = -12/(-10/3)
m = 18/5
m = 18/5
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