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Zachary has in his bank account and automatically withdraws (subtracts) every month to pay for his computer service. Christian has in his bank account and deposits (adds) each month from his newspaper delivery tips. Assuming they make no other deposits or withdrawals, when will Zachary and Christian have the same amount of money in their bank accounts?  

Create a system of equations that represents the problem.

Define your variables.

total amount of money in the account
number of months

Set the equations equal to each other and solve for .

After months they will have the same balance.