\(4x^2-4x+1+4x^2+12x-x-3-2\left(x^2-1\right).\)
\(8x^2-7x+1-3+2-2x^2\)
\(7x^2-7x=7x\left(x-1\right)\)
b)
\(\left(x-1\right)\left(x+1\right)-\left(x-4\right)^2-x\left(x+7\right)\)
\(x^2-1-\left(x^2-8x+16\right)-x^2-7x\)
\(x^2-1-x^2+8x-16-x^2-7x\)
\(x-x^2-17\)