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m in (-oo:+oo)
18 = (-2/3)*m // - (-2/3)*m
18-((-2/3)*m) = 0
(2/3)*m+18 = 0
2/3*m+18 = 0 // - 18
2/3*m = -18 // : 2/3
m = -18/2/3
m = -27
m = -27
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