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x in (-oo:+oo)
-6*cos(pi/3)*x = 4 // - 4
-6*cos(pi/3)*x-4 = 0
-3*x-4 = 0 // + 4
-3*x = 4 // : -3
x = 4/(-3)
x = -4/3
x = -4/3
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