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m in (-oo:+oo)
2*(-(4*m)-5) = -26 // + 26
2*(-(4*m)-5)+26 = 0
2*(-4*m-5)+26 = 0
2*(-4*m-5)+26 = 0
16-8*m = 0
16-8*m = 0
16-8*m = 0 // - 16
-8*m = -16 // : -8
m = -16/(-8)
m = 2
m = 2
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