Example

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

Question

$$\left. \begin{array} { l } { - 400 + ( - 90 ) + 57 + ( - 50 ) + 49 - 49 } \end{array} \right.$$

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