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m in (-oo:+oo)
2/3 = (4/5)*m // - (4/5)*m
2/3-((4/5)*m) = 0
(-4/5)*m+2/3 = 0
2/3-4/5*m = 0 // - 2/3
-4/5*m = -2/3 // : -4/5
m = -2/3/(-4/5)
m = 5/6
m = 5/6
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