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Example

3(r+2s)=2t-4

a⋅(b-2)=3b

3(r+2s)=2t-4

a⋅(b-2)=3b

Question

$$\left. \begin{array} { l } { 84 } \\ { - 45 } \end{array} \right.$$

Evaluate

$39$

Factor

$3\times 13$