book Maths Puzzle Numerical Ability

how do I solve 8x - 4 = 7x

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book Other Question

The value to 2 properties is 650,000.00 One of the properties is worth 25% more than the other. How much is each property worth. Please give reasoning or formula, please. Thank How do I do the following problem?

5^x = 6^(x +8)

Thank you for your help