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m in (-oo:+oo)
(-1/3)*m = -1/10 // + -1/10
(-1/3)*m-(-1/10) = 0
(-1/3)*m+1/10 = 0
1/10-1/3*m = 0 // - 1/10
-1/3*m = -1/10 // : -1/3
m = -1/10/(-1/3)
m = 3/10
m = 3/10
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