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x in (-oo:+oo)

cos(36) = x/10 / - x/10

cos(36)-(x/10) = 0

cos(36)-1/10*x = 0 / - cos(36)

-1/10*x = -cos(36) / : -1/10

x = -cos(36)/(-1/10)

x = 10*cos(36)

x = 10*cos(36)

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