Example

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

Question

$$3 a ^ { 2 } \cdot b + a b \cdot a - 4 a ^ { 2 } - 3 b ^ { 3 } + x \cdot 2 a b =$$

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