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m in (-oo:+oo)
-50 = 5*m+7*m+10 // - 5*m+7*m+10
-(5*m)-(7*m)-50-10 = 0
-5*m-7*m-50-10 = 0
-12*m-60 = 0 // + 60
-12*m = 60 // : -12
m = 60/(-12)
m = -5
m = -5
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