Example

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

Question

$$\frac{ 25 \pm \sqrt{ - { 25 }^{ 2 } -4 \times 1 \times -39 } }{ 2 \times 1 }$$

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