Example

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

Question

$$\begin{aligned}70&\\ \underline{-40}&\end{aligned}$$

Answer

30

Solution


Use the algorithm method.
70
-40
30
Therefore, \(70-40=30\).
\[30\]
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