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a in (-oo:+oo)
4 = (-1/6)*a // - (-1/6)*a
4-((-1/6)*a) = 0
(1/6)*a+4 = 0
1/6*a+4 = 0 // - 4
1/6*a = -4 // : 1/6
a = -4/1/6
a = -24
a = -24
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