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m in (-oo:+oo)
2 = (1/8)*(-m-13) // - (1/8)*(-m-13)
2-((1/8)*(-m-13)) = 0
(-1/8)*(-m-13)+2 = 0
2-1/8*(-m-13) = 0
2-1/8*(-m-13) = 0
1/8*m+29/8 = 0
1/8*m+29/8 = 0
1/8*m+29/8 = 0 // - 29/8
1/8*m = -29/8 // : 1/8
m = -29/8/1/8
m = -29
m = -29
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