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m in (-oo:+oo)
m/2+1 = -2.78 // + 2.78
m/2+1+2.78 = 0
1/2*m+3.78 = 0 // - 3.78
1/2*m = -3.78 // : 1/2
m = -3.78/1/2
m = -7.56
m = -7.56
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