A university bookstore recently sold a wirebound graph-paper notebook for $2.55, and a college-ruled notebook for $3.22. At the start of spring semester, a combination of 50 of these notebooks were sold for a total of $157.65. How many of each type were sold?

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yes i do need more help please

Ok, are you ok with how I arrive at this equation?
2.55x+ 3.22(50-x) = 157.65

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