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m in (-oo:+oo)
(1/3)*m-6 = -88/15 // + -88/15
(1/3)*m-(-88/15)-6 = 0
(1/3)*m+88/15-6 = 0
1/3*m-2/15 = 0 // + 2/15
1/3*m = 2/15 // : 1/3
m = 2/15/1/3
m = 2/5
m = 2/5
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