Example

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

Question

$$(-30+ { 2 }^{ 3 } )-[(-5)+5 \sqrt{ 1 } -5]-(-3) \times (-7)$$

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