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