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m in (-oo:+oo)
(-2/3)*m = 10/21 // - 10/21
(-2/3)*m-(10/21) = 0
(-2/3)*m-10/21 = 0
-2/3*m-10/21 = 0 // + 10/21
-2/3*m = 10/21 // : -2/3
m = 10/21/(-2/3)
m = -5/7
m = -5/7
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