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a in (-oo:+oo)
a/3-(1/6) = -3 // + 3
a/3-(1/6)+3 = 0
a/3-1/6+3 = 0
1/3*a+17/6 = 0 // - 17/6
1/3*a = -17/6 // : 1/3
a = -17/6/1/3
a = -17/2
a = -17/2
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