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x in (-oo:+oo)
(1-x)/12 = (-1/2)*x // - (-1/2)*x
(1-x)/12-((-1/2)*x) = 0
(1-x)/12+(1/2)*x = 0
(1-x)/12+x/2 = 0
(2*(1-x))/(2*12)+(12*x)/(2*12) = 0
2*(1-x)+12*x = 0
10*x+2 = 0
(10*x+2)/(2*12) = 0
(10*x+2)/(2*12) = 0 // * 2*12
10*x+2 = 0
10*x+2 = 0 // - 2
10*x = -2 // : 10
x = -2/10
x = -1/5
x = -1/5
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