16(3x-1)^2-25(x+1)^2=0
[4(3x-1)]^2-[5(x+1)]^2=0
[4(3x-1)+5(x+1)][4(3x-1)-5(x+1)]=0
(17x+1)(7x-9)=0
x=-1/17,x=9/7