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m in (-oo:+oo)
(1/2)*m-(5/3) = (-1/2)*m+19/4 // - (-1/2)*m+19/4
(1/2)*m-((-1/2)*m)-(5/3)-(19/4) = 0
(1/2)*m+(1/2)*m-5/3-19/4 = 0
m-77/12 = 0 // + 77/12
m = 77/12
m = 77/12
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