cos(40)=x/20

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Solution for cos(40)=x/20 equation: 


x in (-oo:+oo)

cos(40) = x/20 // - x/20

cos(40)-(x/20) = 0

cos(40)-1/20*x = 0 // - cos(40)

-1/20*x = -cos(40) // : -1/20

x = -cos(40)/(-1/20)

x = 20*cos(40)

x = 20*cos(40)

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