In the art class, Xiaohong made a rectangular sticky painting with a length of 35 cm. She used a 90 cm colored strip to make a flower border for the sticky picture. What is the width of the sticky picture in centimeters?
美术课上，小红做了一幅长是35厘米的长方形粘画，她用一根90厘米的彩条正好为粘画做了一个花边框，问粘画的宽是多少厘米？
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