Example

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

Question

$$2 \frac { n } { 2 } - \frac { 3 n } { 4 } + \frac { 5 n } { 6 } = 21$$

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