All angles of a triangle added together equal 180 degrees 180=(6x-1)+(x+14)+(20) which simplifies to 180=7x+33 next, solve for x by subtracting 33 147=7x then solve by dividing by 7 21=x plug x back into your original equations to find the angle measures A=6(21)-1 A=125 degrees B=(21)+14 B=35 degrees
