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a in (-oo:+oo)
(2/3)*a+5/6 = (-5/18)*a+(1/18)*a+1/2 // - (-5/18)*a+(1/18)*a+1/2
(2/3)*a-((-5/18)*a)-((1/18)*a)+5/6-(1/2) = 0
(2/3)*a+(5/18)*a+(-1/18)*a+5/6-1/2 = 0
8/9*a+1/3 = 0 // - 1/3
8/9*a = -1/3 // : 8/9
a = -1/3/8/9
a = -3/8
a = -3/8
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