Example

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

Question

$$3 - 12 = -$$

Answer

-9

Solution


Use this rule: \(a-b=-(b-a)\).
\[-(12-3)\]
Use the algorithm method.
012
12
-3
9
After simplification, we have:
\[-(12-3)=-9\]
Therefore, \(3-12=-9\).
\[-9\]
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