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