Example

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

Question

$$(1^{3}+2^{3}+3^{3}):3^{2}+5^{12}\cdot4^{12}:20^{11}-3^{2}$$

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