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