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x in (-oo:+oo)
y = -6*cos(2/3)*x // + -6*cos(2/3)*x
y-(-6*cos(2/3)*x) = 0
6*cos(2/3)*x+y = 0
6*cos(2/3)*x+y = 0 // - y
6*cos(2/3)*x = -y // : 6*cos(2/3)
x = -y/(6*cos(2/3))
x = (-1/6)*(cos(2/3))^-1*y
x = (-1/6)*(cos(2/3))^-1*y
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