<PRE><B>Question 306983</B>
2(3x+1)(x-7)=0

(3x+1)(x-7)=0

3x(x-7)+1(x-7)=0

3x^2-21x+x-7 =0

3x^2-20x-7=0

3x^2-21x+x-7=0

3x(x-7)+1(x-7)=0

(x-7)(3x+1)=0

x=7 Or x=-1/3</PRE>