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m in (-oo:+oo)
(-2/3)*m+4 = 82/21 // - 82/21
(-2/3)*m-(82/21)+4 = 0
(-2/3)*m-82/21+4 = 0
2/21-2/3*m = 0 // - 2/21
-2/3*m = -2/21 // : -2/3
m = -2/21/(-2/3)
m = 1/7
m = 1/7
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