Example

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

Question

$$(-7)^{2}+\sqrt{2}\times(-7)+6$$

Evaluate

$55-7\sqrt{2}\approx 45.100505063$

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