(2x-5)^{2}-(2x-3)(2x+3)=0 4х2-20х+25-4х2+9=0 -20х=-34 х=-34/-20 х=1,7 2(2x+1)^{2}-8(x+1)(x-1)=34 8х2+8х+2-8х2+8=34 8х=24 х=3