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m in (-oo:+oo)
(2*m)/3+8 = m/2-1 // - m/2-1
(2*m)/3-(m/2)+1+8 = 0
1/6*m+9 = 0 // - 9
1/6*m = -9 // : 1/6
m = -9/1/6
m = -54
m = -54
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