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