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