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m in (-oo:+oo)
(-2/3)*m+6 = 83/15 // - 83/15
(-2/3)*m-(83/15)+6 = 0
(-2/3)*m-83/15+6 = 0
7/15-2/3*m = 0 // - 7/15
-2/3*m = -7/15 // : -2/3
m = -7/15/(-2/3)
m = 7/10
m = 7/10
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