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There is a number written on the board. One student increased the number by 23, but another student decreased the number by 1.
The first student’s result was 7 times greater than the result of the second student. What is the number written on the board?
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x + 23 = 7(x-1).
x + 23 = 7x - 7,
6x = 23+7 ---> 6x = 30 ---> x = 5.