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m in (-oo:+oo)
15 = m+4*m-10 // - m+4*m-10
10-m-(4*m)+15 = 0
10-m-4*m+15 = 0
25-5*m = 0 // - 25
-5*m = -25 // : -5
m = -25/(-5)
m = 5
m = 5
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