book Maths Puzzle Numerical Ability

how do i solve for X in this problem: X>10 (x to the 10th power) =5555

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book Other Question

An item sells for $48 after a 20% discount. What was the original price of the item?
My answer was $60
Thanks
What is the answer to:

1.5 = -1.2n - 0.9

Thank you for your time in helping me.
Annie