Mathematics for IGCSE & O level - Equations (Section 8 - No. 27)
What must be done to both sides of an equation when changing the subject of a formula?
The same operation must be done.
Different operations can be used.
Only the right side needs to be changed.
Only the left side needs to be changed.
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To keep the equation balanced, you have to maintain equality by doing the same thing to both sides.