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m in (-oo:+oo)
(4*m)/7-(3/7) = 3 // - 3
(4*m)/7-(3/7)-3 = 0
(4*m)/7-3/7-3 = 0
4/7*m-24/7 = 0 // + 24/7
4/7*m = 24/7 // : 4/7
m = 24/7/4/7
m = 6
m = 6
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