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m in (-oo:+oo)
8 = (-2/3)*m // - (-2/3)*m
8-((-2/3)*m) = 0
(2/3)*m+8 = 0
2/3*m+8 = 0 // - 8
2/3*m = -8 // : 2/3
m = -8/2/3
m = -12
m = -12
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