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m in (-oo:+oo)
(2/7)*(4*m-18) = 0
2/7*(4*m-18) = 0
( 2/7 )
2/7 = 0
m belongs to the empty set
( 4*m-18 )
4*m-18 = 0 // + 18
4*m = 18 // : 4
m = 18/4
m = 9/2
m = 9/2
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