Example

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

Question

$$\quad ( 4 b x ^ { 2 } ) + ( - 9 b x ^ { 2 } ) = - 5 b x ^ { 2 }$$

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