Solve the following equations.
2x^2-3x+1=3
4x^2+5x-3=17x-12
7x^2+10x-20=x^{2}-x+15
\left(2x+1\right)\left(x+7\right)=10x-3
x^{2}=16x
2x^{2}=x+6
\left(3x+1\right)\left(x-5\right)=-x^{2}-12x-4
Solve the following equations.
2x^2-3x+1=3
4x^2+5x-3=17x-12
7x^2+10x-20=x^{2}-x+15
\left(2x+1\right)\left(x+7\right)=10x-3
x^{2}=16x
2x^{2}=x+6
\left(3x+1\right)\left(x-5\right)=-x^{2}-12x-4