math
posted by leaky .
a store sells y+3 boxes of pencils. each box has 5y7 pencils. how many pencils does the store sell?

Combine y+3 with 5y7
Y+3=5y7
Subtract 3 to both sides
Y=5y10
Subtract 5y to both sides
4y=10
Divide 4 to both sides
Y=25