exam Maths Puzzle Numerical Ability

If a certain number is 3 more than 7 times itself, what is the number?

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The cost of a bookcase was $70.00. Overhead associated with the bookcase was $10.00. Markup on the bookcase was 80% of cost. The merchant marked the bookcase down by 25% for a sal Please help with the following problem: e^x = 2^x+1