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