Example

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

Question

$$\frac { 9 : } { - 5 a - 7 b , 3 a - 2 b , } { a }$$

Answer

9

Solution


Simplify.
\[9\]
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