The base of an isosceles triangle is seven less than twice one of the congruent sides. If the perimeter of the triangle is 63 cm, find the length of each side.

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm