I think the equation would be 101=4.50b+25 where b is equal to the the maount of bracelets and 25 dollars for the materials and 101 is how much she had at the end of the month
So you would subract 25 from each sides
So 25-25 you cancel off and on the other side 101-25=76
Then, it would be 4.50b=76 so you divide 4.50 on each side and get b=17