8(2w-6)+4(-1-5w)=0 solve and show work.

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Which of the binomials below is a factor of this exression? 16x^2+40xy+25y^2 a.4x-5y b. 2x-5y c.4x+5y d.2x+5y