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m in (-oo:+oo)
2*m+3 = 6*m-13 // - 6*m-13
2*m-(6*m)+3+13 = 0
2*m-6*m+3+13 = 0
16-4*m = 0 // - 16
-4*m = -16 // : -4
m = -16/(-4)
m = 4
m = 4
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