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m in (-oo:+oo)
m/8-2.5 = -4 // + 4
m/8-2.5+4 = 0
1/8*m+1.5 = 0 // - 1.5
1/8*m = -1.5 // : 1/8
m = -1.5/1/8
m = -12
m = -12
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