英语翻译the length of rectangle is three more than twice its wid

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英语翻译
the length of rectangle is three more than twice its width.
find the length and width of the rectangle.
if its perimeter is 84cm.

翻译：若长方形的周长是84厘米,它的长比宽的2倍还多3厘米,问长方形的长和宽分别是多少?
设长方形的宽是X厘米,长是（2X+3）厘米. (Suppose the width of the rectangle is X cm, the length of the rectangle is (2X+3)cm.)
2[X+(2X+3)]=84
3X+3=42
3X=39
X=13 2X+3=29
所以长方形的宽是13厘米,长是29厘米. (Therefore the width of the rectangle is 13 cm, the length of the rectangle is (2X+3)cm.)

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