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a in (-oo:+oo)
4/3 = (-5/4)*a // - (-5/4)*a
4/3-((-5/4)*a) = 0
(5/4)*a+4/3 = 0
5/4*a+4/3 = 0 // - 4/3
5/4*a = -4/3 // : 5/4
a = -4/3/5/4
a = -16/15
a = -16/15
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