Shades R Us charges $20 per day to rent a lounge chair and $15 per day to rent an umbrella. Dan and Lisa paid a total of $245 to rent a lounge chair and an umbrella each during their vacation. Lisa rented the chair and umbrella for 1 day less than Dan. The following equation represents this situation, where x represents the number of days Dan rented the lounge chair and umbrella.
20x + 15x + 20(x − 1) + 15(x − 1) = 245
What is the total amount Dan paid to rent the lounge chair and umbrella during his vacation?

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$80
$105
$140
$175

it must ne 140 dollars

Hint:
20(x - 1) = 20x - 20
15(x - 1) = 15x - 15

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