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Question:

John’s bank is overdrawn. After he makes a $120 deposit, John sees that his account still is overdrawn by $75. So what was John's balance before making his deposit?

A the original balance was overdrawn by $195
Explaination

Translate the words into an equation. Let B represent the original balance.
Original Balance+ John Deposit=Current Balance
B + $120 = −$75
To isolate un unknown value B, subtract 120 from both sides.
B+120-120=-75-120
Simplify both sides.
B=-195
Answer the Question. The original balance was overdrawn to the tune of $195.