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a in (-oo:+oo)
8/2 = -a/9 // + -a/9
8/2-(-a/9) = 0
(1/9)*a+8/2 = 0
1/9*a+4 = 0 // - 4
1/9*a = -4 // : 1/9
a = -4/1/9
a = -36
a = -36
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