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m in (-oo:+oo)
(2*m)/7-3 = m/4 // - m/4
(2*m)/7-(m/4)-3 = 0
1/28*m-3 = 0 // + 3
1/28*m = 3 // : 1/28
m = 3/1/28
m = 84
m = 84
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