cos(60)=x/7

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Solution for cos(60)=x/7 equation: 


x in (-oo:+oo)

cos(60) = x/7 // - x/7

cos(60)-(x/7) = 0

cos(60)-1/7*x = 0 // - cos(60)

-1/7*x = -cos(60) // : -1/7

x = -cos(60)/(-1/7)

x = 7*cos(60)

x = 7*cos(60)

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