(6+7x^2)/(7x+3)
7 xx x=-3
7x=-3
x=-3/7 or -0.429 to the nearest 3 decimal places
color(white)(.................)ul(x-0.429)
color(white)(aa)7x+3|7x^2+0+6
color(white)(..............)ul(7x^2+3x)
color(white)(........................)-3x+6
color(white)(.........................)ul(-3x-1.287)
color(white)(..............................)0+7.287