exam Maths Puzzle Numerical Ability

Simpfly

6h + 5(h-5)

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exam Other Question

Make a conjecture about the relationship between the original number and the final number in the following process.
Pick a number
Multiply the number by 12
Add 12 to the product
Divide the sum by 4
Subtract 3 from the quotient
There is a similar problem on the board already, but this one does not solve the same way, please help.

Find the solution of the equation, correct to six decimal places:

5^2x