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m in (-oo:+oo)
m-1 = 23-2*m // - 23-2*m
m-(-2*m)-23-1 = 0
m+2*m-23-1 = 0
3*m-24 = 0 // + 24
3*m = 24 // : 3
m = 24/3
m = 8
m = 8
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