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