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m in (-oo:+oo)
(2*m)/3+4*m = 7 // - 7
(2*m)/3+4*m-7 = 0
14/3*m-7 = 0 // + 7
14/3*m = 7 // : 14/3
m = 7/14/3
m = 3/2
m = 3/2
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