Example

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

Question

$$\frac { a ^ { 2 } - 9 } { a ^ { 2 } - 5 a + 6 } + \frac { a + 3 } { 3 a - 6 } \quad 121$$

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