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m in (-oo:+oo)
5*m-(2*m)+10 = -5 // + 5
5*m-(2*m)+5+10 = 0
5*m-2*m+5+10 = 0
3*m+15 = 0 // - 15
3*m = -15 // : 3
m = -15/3
m = -5
m = -5
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