Question

For your birthday, you received $325 towards a new laptop that costs $750. You start saving $85 a month. How many months will it take you to save up enough money for the laptop?
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Answer 1

You are trying to get $750 so your equation will start like this:
750=....
you add $85 each month to the amount you originally got which is $325
so, 750=85x+325

first subtract 325 from 750 

425=85x

then divide 425 by 85

x=5

It will take 5 months to earn enough for the laptop. 

Answer 2

Another way to find out is 750-325=425 then divide 425 by 85 the answer to that is the answer to your question