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m in (-oo:+oo)
(-2/3)*m+2 = 7/3 // - 7/3
(-2/3)*m-(7/3)+2 = 0
(-2/3)*m-7/3+2 = 0
-2/3*m-1/3 = 0 // + 1/3
-2/3*m = 1/3 // : -2/3
m = 1/3/(-2/3)
m = -1/2
m = -1/2
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