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x in (-oo:+oo)
((-2*x)/6)*x^12 = 80*x // - 80*x
((-2*x)/6)*x^12-(80*x) = 0
((-2*x)/6)*x^12-80*x = 0
-1/3*x^13-80*x = 0
-x*(1/3*x^12+80) = 0
1/3*x^12 = -80 // : 1/3
x^12 = -240
-x = 0
-1*x = 0 // : -1
x = 0
x = 0
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