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