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SOLUTION
Now Gina originally has $90 in her account. She takes $2 everyday
So since we are told to take d as the number of days, this means in any number of days, the amount she takes becomes
[tex]\begin{gathered} 2dollars\times d \\ =2\times d \\ =2d \end{gathered}[/tex]The amount left in her account should be gotten by subtracting 2d from the original amount of $90, so that becomes
[tex]90-2d[/tex]Since we were told that a should represent the amount left, it implies that
[tex]a=90-2d[/tex]Hence the equation for Gina's bank account is
[tex]a=90-2d[/tex]
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