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m in (-oo:+oo)
m/5 = m/8-1 // - m/8-1
m/5-(m/8)+1 = 0
3/40*m+1 = 0 // - 1
3/40*m = -1 // : 3/40
m = -1/3/40
m = -40/3
m = -40/3
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