A drinking straw of length 21 Cm is cut into 3 pieces.the length of the first piece is x cm the second piece is 3cm shorter than the first piece.

(a)state,in terms of x,the length of each of the piece.

(b)write an expression,in terms of x, to represent the sum of the lengths of the three pieces of drinking straw.

(c)hence,calculate the value of x

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