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a in (-oo:+oo)
a/3 = (a-3)/2 // - (a-3)/2
a/3-((a-3)/2) = 0
(-1*(a-3))/2+a/3 = 0
(-1*3*(a-3))/(2*3)+(2*a)/(2*3) = 0
2*a-1*3*(a-3) = 0
9-a = 0
(9-a)/(2*3) = 0
(9-a)/(2*3) = 0 // * 2*3
9-a = 0
9-a = 0 // - 9
-a = -9 // * -1
a = 9
a = 9
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