cos2x=-1/2

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Solution for cos2x=-1/2 equation: 


3*a+4*c-23;a+7*c-19;3*b+4*d-22;b+7*d-13

4*d-(3*b)-22;b+7*d-13

(4*x)/3

5-((3/4)*k) = 8

4*d-3*b-22;b+7*d-13

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