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a in (-oo:+oo)
(1/2)*a+(3/4)*a+2/3 = -28/3 // + -28/3
(1/2)*a+(3/4)*a+2/3-(-28/3) = 0
(1/2)*a+(3/4)*a+2/3+28/3 = 0
5/4*a+10 = 0 // - 10
5/4*a = -10 // : 5/4
a = -10/5/4
a = -8
a = -8
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