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m in (-oo:+oo)
5*(-m-3) = -45 // + 45
5*(-m-3)+45 = 0
5*(-m-3)+45 = 0
30-5*m = 0
30-5*m = 0
30-5*m = 0 // - 30
-5*m = -30 // : -5
m = -30/(-5)
m = 6
m = 6
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