7x^2-5x=2x^2+x
5x^2-6x=0
x(5x-6)=0
x=0,x=6/59（x+5）^2=4（2x-5)^2[2(2x-5)]²-[3(x+5)]²=0 (4x-10)²-(3x+15)²=0 (4x-10+3x+15)(4x-10-3x-15)=0 (7x+5)(x-25)=0 x=-5/7,x=25