Example

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

Question

$$x = \frac { a ^ { 2 } + b ^ { 2 } } { 5 a } , y = \frac { a ^ { 2 } - b ^ { 2 } } { 4 a }$$

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