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a in (-oo:+oo)
a-a+1/2 = 1-((a-2)/3) // - 1-((a-2)/3)
(a-2)/3+a-a+1/2-1 = 0
(2*(a-2))/(2*3)+(2*3*a)/(2*3)+(2*3*(-a))/(2*3)+(1*3)/(2*3)+(-1*2*3)/(2*3) = 0
2*(a-2)+2*3*a+2*3*(-a)+1*3-1*2*3 = 0
8*a-6*a-6-4+3 = 0
2*a-6-4+3 = 0
2*a-6-1 = 0
2*a-7 = 0
(2*a-7)/(2*3) = 0
(2*a-7)/(2*3) = 0 // * 2*3
2*a-7 = 0
2*a-7 = 0 // + 7
2*a = 7 // : 2
a = 7/2
a = 7/2
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