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