Last semester's math exercise book of grade five in primary school 17.

Suppose the length of the bottom is x cm and the length of the top and bottom is 3xcm, so that the top and bottom minus 4 cm is (3x-4) cm, and the bottom plus 10 cm is (x+ 10) cm. At this time, the lengths of the top and bottom are equal, that is, 3x-4 = x+ 10, and x=7 is obtained.

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