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m in (-oo:+oo)
39/5 = 2*m // - 2*m
39/5-(2*m) = 0
39/5-2*m = 0
39/5-2*m = 0 // - 39/5
-2*m = -39/5 // : -2
m = -39/5/(-2)
m = 39/10
m = 39/10
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