Example

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

Question

$$- 4 x ^ { 2 } + 18 x ^ { 2 } + 3 x ^ { 2 } - 5 x ^ { 2 }$$

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