Example

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

Question

$$\frac { 188 , 11 ( 1 ) } { 411 + 100 \cdot 1 \frac { 120 } { 1180 } \cos 18 }$$

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