Example

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

Question

$$49 x ^ { 2 } - b = ( 7 x + \frac { 1 } { 2 } ) ( 7 x - \frac { 1 } { 2 } ) , b$$

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