If both sides of the equation multiply or divide by 12.3, the left and right sides are still equal. If both sides of the equation add or subtract 3.5, the left and right sides are still equal

If both sides of the equation multiply or divide by 12.3, the left and right sides are still equal
wrong
Add or subtract 3.5 on both sides of the equation, and the left and right sides are still equal
yes
The first mistake
The second is right

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