Book Maths Puzzle Algebra

Agency pay 137 per day for equipment operators and 88 per day for general labor. if 39 people were hired and payroll was 4265 how many equipment operators were employed and how ma

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Book Other Question

What amount of each mixture, one 95% alcohol and the other 15% alcohol, must be used to make 10 liters of a mixture which is 45% alcohol? Solving the equation
Problem
4Y+7=5Y+13



But I need a breakdown, when I first tried to complete this problem I subtracted 7 from both sides but I was left with 9Y (4Y+5Y), I just need a break down I am doing someting wrong.



Thanks

Helpless in Durham