75% of 340 is 85 so 85 laptops were sold at Best Bargin
Each year + $25. 4 years = $100. 100+1000= $1100
Subtract 4x from both sides
4x +2 = 7x - 13 would then simplify to
3x - 13 = 2 ( you can switch the problem around as long as you dont switch the variables around )
then you have to + 13 which simplifies to
3x = 15
then you divide by 3 which equals
x=5