Example

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

Question

$$[21 \times { 3 }^{ 0 } -5 \times { 2 }^{ 2 } -4 \times { 2 }^{ -1 } + { 5 }^{ 0 } ]$$

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