13 times the sum of x and 9y
The sum of x and 9y means we add 9y to x:
x + 9y
Now multiply this sum by 13:
13(x + 9y)
The sum of x and 9y means we add 9y to x:
x + 9y
Now multiply this sum by 13:
13(x + 9y)
13 times the sum of x and 9y
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