Example

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

Question

$$\frac { 50 ^ { \circ } } { \frac { 8 A ( B ) B ( 18 ) ( 18 ) } { + 8478 } + 180 ^ { \circ } }$$

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