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First, let's simplify the expression in the parentheses:
3 12/17 + 2 5/17 = 3 + 2 + 12/17 + 5/17 = 5 + 17/17 = 6
Next, let's simplify the expression in the other set of parentheses:
4.2 - 2 3/5 = 4 + 0.2 - 2 - 0.6 = 1.6 - 0.4 = 1.2
So now we have:
15: 6 + 1.2/4
Let's simplify the fraction:
1.2/4 = 0.3
So now we have:
15: 6 + 0.3
Let's add 6 and 0.3:
6 + 0.3 = 6.3
So the final answer is:
15: 6.3 = 2.38095238... (rounded to 9 decimal places)
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