Example

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

Question

$$0 \times 10 + \frac { 1 } { 2 } \times 4 \times 10 \times 4 \times 10$$

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