Problem
a) \( 2 x-(4+x) \) b) \( (3 y-1)+5 \) c) \( 4 n-(3+n) \) d) \( (7 z-2)-3 \)
Solution
Step 1 ：\( 2 x - (4 + x) = 2 x - 4 - x \)
Step 2 ：\( (3 y - 1) + 5 = 3 y - 1 + 5 = 3 y + 4 \)
Step 3 ：\( 4 n - (3 + n) = 4 n - 3 - n\)
Step 4 ：\( (7 z - 2) - 3 = 7 z - 2 - 3 = 7 z - 5 \)
