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m in (-oo:+oo)
-(5*m)-3 = -38 // + 38
38-(5*m)-3 = 0
38-5*m-3 = 0
35-5*m = 0 // - 35
-5*m = -35 // : -5
m = -35/(-5)
m = 7
m = 7
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