Emma took a certain 100-point test twice. The points received on the test can be converted to a rating from according to the formula, R=1.4P+23, where R represents the rating and P represents the points received. How many more points did Emma receive on her second test compared to her first if her rating increased by 63?
I do not need an answer, the correct answer is 45. I would like a formula to calculate this along with somewhat of an explanation.

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my name is emma :)

@Emmaleee : You have improved a lot :-p :D...

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