Algebraic expressions and rearranging formulae

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6 Terms

1
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expression

contains unknown value and no equals sign

2
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equation

contains unknown value, can be solved

3
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identity

always true no matter which values are substituted

4
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formula

links a value to 1+ other values

5
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plural of formula

formulae

6
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how to rearrange formulae when the subject appears 2+ times

factorise subjects out of the formula, divide bracketed section