I realised that there is a better way to memorise the 4 rules:
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Find x in the equation 2 + x = 10.
Wrong: Shift the 2 from the LHS to RHS and change the sign > x = 10 - 2
Correct: Subtract 2 from both sides > 2 + x - 2 = 10 - 2
Answer: x = 8
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