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m in (-oo:+oo)
2-5*m-(6*m) = -20 // + 20
2-5*m-(6*m)+20 = 0
2-5*m-6*m+20 = 0
22-11*m = 0 // - 22
-11*m = -22 // : -11
m = -22/(-11)
m = 2
m = 2
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