cos(60)=x/21

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Solution for cos(60)=x/21 equation: 


x in (-oo:+oo)

cos(60) = x/21 // - x/21

cos(60)-(x/21) = 0

cos(60)-1/21*x = 0 // - cos(60)

-1/21*x = -cos(60) // : -1/21

x = -cos(60)/(-1/21)

x = 21*cos(60)

x = 21*cos(60)

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