Do you know that if you pick a number, add to the same number, subtract with the same number, divide with the same number and multiply by the same number gives you the final answer of the number?
Eg
Pick 7
Such that 7+7-7÷7×7 = 7
.
7+7 =14, 14-7=7, 7÷7=1, 1×7=7
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