9 plus 11 (20) plus 15 (35) plus 18 is equal to 53
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5/6 plus 7/9 is 1 and 11/18.
33x + 9 = 18 ----> 33x = 9 ----> x = 3/11
9 dollars plus 12 quarters plus 25 dimes plus 11 nickels plus 18 pennies = $15.23
1/9 = 2/18 3/6 = 9/18 2/18 + 9/18 = 11/18
1/2 + 1/9 = 9/18 + 2/18 = 11/18