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1. Just imagine what operation has been done last to ‘a’ and that is the operation you should undo first, for example: w = 3(2a+b)-4 Here, the -4 is the last thing that happens to ‘a’ so we do the opposite by ADDING 4 to the other side to get rid of it: 2. w+4 = 3(2a+b) : Then just repeat this process until you get ‘a’ by itself. 3. w+4 = 6a+3b (expand the bracket) 4. w+4-3b = 6a 5. w+4-3b/6 = a
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Work out the value of her house at the start of 2017
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2a=b make a the subject
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