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To expand 7/10(5d + 6), we distribute the fraction 7/10 to each term inside the parentheses:
7/10 * 5d + 7/10 * 6
This becomes:
35d/10 + 42/10
Since the denominators are the same, we can add the fractions together:
(35d + 42)/10
Therefore, the expanded form of 7/10(5d + 6) is (35d + 42)/10.