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m in (-oo:+oo)
7-m = 4*m-13 // - 4*m-13
7-m-(4*m)+13 = 0
7-m-4*m+13 = 0
20-5*m = 0 // - 20
-5*m = -20 // : -5
m = -20/(-5)
m = 4
m = 4
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