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12 questions from this quiz
A pair of balanced scales
An unknown number (a variable)
Get the variable on its own on one side
Same thing to both sides
Subtract that number from both sides
Divide both sides by that number
Add that number to both sides
m=9m = 9m=9
p=4.5p = 4.5p=4.5
a=9a = 9a=9
An equals sign
Substitute it back into the original
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