How many triangles can be constructed with 3 angles, each measuring 63°?

What should be done to solve the equation? x+14=21 add 14 to both sides of the equation. subtract 14 from the left side of the equation. add 14 to the left side and subtract 14 from the right side of the equation. subtract 14 from both sides of the equation.

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

Need this asap if anyone can i would be very grateful. if you could show workings that would really