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m in (-oo:+oo)
(-1/6)*m+2/3 = 15/22 // - 15/22
(-1/6)*m+2/3-(15/22) = 0
(-1/6)*m+2/3-15/22 = 0
-1/6*m-1/66 = 0 // + 1/66
-1/6*m = 1/66 // : -1/6
m = 1/66/(-1/6)
m = -1/11
m = -1/11
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