Question 473498
{{{(6x+1)/(x+20) = (20x+3)/(3x+7)}}}...cross multiply


{{{(6x+1)(3x+7) = (20x+3)(x+20)}}}


{{{18x^2+42x+3x+7= 20x^2+200x+3x+60}}}

{{{18x^2+45x+7= 20x^2+203x+60}}}

{{{0= 20x^2-18x^2+203x-45x+60-7}}}

{{{2x^2+158x+53=0}}}


*[invoke quadratic_formula 2, 158, 53, "x"]