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x in (-oo:+oo)
cos(17) = x/11 // - x/11
cos(17)-(x/11) = 0
cos(17)-1/11*x = 0 // - cos(17)
-1/11*x = -cos(17) // : -1/11
x = -cos(17)/(-1/11)
x = 11*cos(17)
x = 11*cos(17)
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