cos(20)=x/80

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Solution for cos(20)=x/80 equation: 


x in (-oo:+oo)

cos(20) = x/80 // - x/80

cos(20)-(x/80) = 0

cos(20)-1/80*x = 0 // - cos(20)

-1/80*x = -cos(20) // : -1/80

x = -cos(20)/(-1/80)

x = 80*cos(20)

x = 80*cos(20)

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