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m in (-oo:+oo)
(2*m)/3-1 = m/2-(7/3) // - m/2-(7/3)
(2*m)/3-(m/2)+7/3-1 = 0
1/6*m+4/3 = 0 // - 4/3
1/6*m = -4/3 // : 1/6
m = -4/3/1/6
m = -8
m = -8
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