Example

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

Question

$$30 - 2 \times \{ 10 \frac { 1 } { 2 } - ( \frac { 5 } { 3 } \div \frac { 1 } { 3 } ) \}$$

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