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m in (-oo:+oo)
3*m+5 = 5*m-15 // - 5*m-15
3*m-(5*m)+5+15 = 0
3*m-5*m+5+15 = 0
20-2*m = 0 // - 20
-2*m = -20 // : -2
m = -20/(-2)
m = 10
m = 10
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