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m in (-oo:+oo)
(2/3)*(m-6) = 3 // - 3
(2/3)*(m-6)-3 = 0
2/3*(m-6)-3 = 0
2/3*(m-6)-3 = 0
2/3*m-7 = 0
2/3*m-7 = 0
2/3*m-7 = 0 // + 7
2/3*m = 7 // : 2/3
m = 7/2/3
m = 21/2
m = 21/2
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