3 times a number is greater than the double of itself by 5.

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• 3 times a number is greater than the double of itself by 5.
• if a certain number is 3 more than 7 times itself翻译这句话
• 英语或数学达人请进!1.The sum of 4 consecutive even integers is 76.What is the 3rd highest number?2.A piece of rope 126 feet long is cut into 3 pieces.The second piece is twice as long as the first piece,and the third piece is 3 times as long as the second?How long is the second piece of rope?3.The length of a certain rectangle is 3 more than its width.If the length is tripled and the width is double,the perimeter of the new rectangle is 42cm more than the orig
• if a certain number is 3 more than 7 times itself
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• 1.复数z=1-i/1+i,则|z|=?