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a in (-oo:+oo)
6 = (-1/5)*a // - (-1/5)*a
6-((-1/5)*a) = 0
(1/5)*a+6 = 0
1/5*a+6 = 0 // - 6
1/5*a = -6 // : 1/5
a = -6/1/5
a = -30
a = -30
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