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The little monkey ate four more peaches than the rest, and the little monkey ate another one, which was three times as much as the rest. How many peaches does the little monkey have?
Both sides of the equation are the total number of peaches. Suppose you eat x for the first time.

Left: After eating for the first time, there are four more than the rest, that is, X-4 is left, making a total of X+(X-4). You can omit the brackets, which is X+X-4.

Right: After eating for the second time, I ate X+ 1 in total. At this time, I ate the remaining three times, and the rest was X+ 1/3, which made a total of (X+ 1)+(X+ 1)/3, which is 4 (X

Left = right, and at the same time get the formula:

X+X- 1=4(X+ 1)/3

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