Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\frac { ( 15.7 ) ^ { 2 } - ( 4.4 ) ^ { 2 } } { ( 15.7 + 4.4 ) ^ { 2 } } = ?$$

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