25(x-1)2=16(x+ 2)2 |(x-1)/(x+2)|=4/5 (x-1)/(x+2)=±4/5 1-3/(x+2)=±4/5 3/(x+2)=1±4/5 3/(x+2)=9/5或1/5 ∴x= -1/3或13.