12-2(x-1)²=4(x-2)-(x-3)(2x-5)= (x-3)(x+3)-(2x-1)²=x(6-3x)-9= 3(x+2)²+(2x-1)²-7(x+3)(x-3)=28

12-2(x-1)²=4(x-2)-(x-3)(2x-5) 12-2(x²-2x+1)=4x-8-2x²+5x+6x-13 12-2x²+4x-2=4x-8-2x²+5x+6x-13 11x=-31 (x-3)(x+3)-(2x-1)²=x(6-3x)-9 x²+3x-3x-9+4x²-2x²+1=6x-3x²-9 6x²-6x=-1 3(x+2)²+(2x-1)²-7(x+3)(x-3)=28 3(x²+4x²+4)+4x²-4x+1-7(x²-3x+3x-9)=28 3x²+12x²+12+4x²-4x+1-7x²+21x-21+63=28 12x²+17x=83