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m in (-oo:+oo)
(2*m)/3-(m/5) = 7 // - 7
(2*m)/3-(m/5)-7 = 0
7/15*m-7 = 0 // + 7
7/15*m = 7 // : 7/15
m = 7/7/15
m = 15
m = 15
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