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m in (-oo:+oo)
m/6 = -2/3 // + -2/3
m/6-(-2/3) = 0
m/6+2/3 = 0
1/6*m+2/3 = 0 // - 2/3
1/6*m = -2/3 // : 1/6
m = -2/3/1/6
m = -4
m = -4
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