Example

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

Question

$$\frac { 2 } { 7 } x + \frac { 1 } { 2 } x = \frac { 1 } { 4 } - x + 1$$

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