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a in (-oo:+oo)
a/3 = -5/6 // + -5/6
a/3-(-5/6) = 0
a/3+5/6 = 0
1/3*a+5/6 = 0 // - 5/6
1/3*a = -5/6 // : 1/3
a = -5/6/1/3
a = -5/2
a = -5/2
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