Example

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

Question

$$50^{\circ}; 130^{\circ}; 120^{\circ}$$

Evaluate

$\sqrt{3}\approx 1.732050808$

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