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There are 52 tens in 528. This is because 528 divided by 10 equals 52. Each ten in the number 528 represents a multiple of 10 in the place value system.
The tens place is the second digit in a number to the left of the decimal. For example, in 52, the 5 would be the number in the tens place.
4x - 7 = 45 Therefore, 4x = 45 + 7 = 52 x = 52/4 x = 13