The cost of the guitar is $505.
Step-by-step explanation:
Let the cost of guitar be x
Cost of guitar : x
Selling price : $890
Selling price is $120 less than twice the cost
Twice the cost means 2x
$120 less means "120 - 2x"
Form an equation
890 = 120 - 2x
890 + 120 = 2x
1010 = 2x
x = 505
Therefore, the cost of the guitar is $505.
Keyword: Cost
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