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m in (-oo:+oo)
m/3 = (m+4)/7 // - (m+4)/7
m/3-((m+4)/7) = 0
(-1*(m+4))/7+m/3 = 0
(-1*3*(m+4))/(3*7)+(7*m)/(3*7) = 0
7*m-1*3*(m+4) = 0
4*m-12 = 0
(4*m-12)/(3*7) = 0
(4*m-12)/(3*7) = 0 // * 3*7
4*m-12 = 0
4*m-12 = 0 // + 12
4*m = 12 // : 4
m = 12/4
m = 3
m = 3
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