Example

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

Question

$$=18; \sqrt{45}+\sqrt{125}=\frac{3}{\sqrt{5}}$$

Evaluate

$18$

Factor

$2\times 3^{2}$

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