Answer:
D
Explanation:
Since the weighing scale is balanced,
weight of the right side= weight on the left side
7(1)= 3x +1
7= 3x +1
Minus 1 on both sides:
3x= 7 -1
3x= 6
Divide both sides by 3:
x= 6 ÷3
x= 2
Thus, option D is correct.
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