Example

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

Question

$$\frac{ n }{ 2 } -3 \frac{ n }{ n } +5 \frac{ n }{ 6 } =21$$

Solve for n

$n=18$

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