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x in (-oo:+oo)
cos(54) = x/30 // - x/30
cos(54)-(x/30) = 0
cos(54)-1/30*x = 0 // - cos(54)
-1/30*x = -cos(54) // : -1/30
x = -cos(54)/(-1/30)
x = 30*cos(54)
x = 30*cos(54)
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