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(5x+9)^2 - (7x-5)^2 = 0
(5x+9+7x-5)(5x+9-7x+5)=0
(12x+4)(-2x+14)=0
(3x+1)(-x+7)=0
3x+1=0
x=-1/3
-x+7=0
x=7