First, let's simplify the expression inside the parentheses:
2/7 + 3/14 = (4/14) + (3/14) = 7/14 = 1/2
Now, let's simplify the expression outside the parentheses:
1/2 (7.5 - 13.5) = 1/2 (-6) = -3
Therefore, the final answer is -3.
First, let's simplify the expression inside the parentheses:
2/7 + 3/14 = (4/14) + (3/14) = 7/14 = 1/2
Now, let's simplify the expression outside the parentheses:
1/2 (7.5 - 13.5) = 1/2 (-6) = -3
Therefore, the final answer is -3.