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m in (-oo:+oo)
-(3*m)-10 = -25 // + 25
25-(3*m)-10 = 0
25-3*m-10 = 0
15-3*m = 0 // - 15
-3*m = -15 // : -3
m = -15/(-3)
m = 5
m = 5
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