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