Example

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

Question

$$-( { 3 }^{ 2 } -15+2)+ \{ -6+[4-1+( \sqrt{ 144 } -9)+7] \}$$

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