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m in (-oo:+oo)
10 = (-2/3)*m // - (-2/3)*m
10-((-2/3)*m) = 0
(2/3)*m+10 = 0
2/3*m+10 = 0 // - 10
2/3*m = -10 // : 2/3
m = -10/2/3
m = -15
m = -15
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