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(m+3)/(m-7)=(4m-3)/(m+3)
(m-7)(4m-3)=(m+3)(m+3) m różne od 7 i -3
4m^2-3m-28m+21=m^2+6m+9
3m^2 -37 m +12=0
delta = 37^2 -4*3*12=1225
pierwiastek z delty = 35
m1=(37-35)/6=1/3
m2=(37+35)/6=12
odp. Dla m =1/3 lub m=12