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a in (-oo:+oo)
(-4*a)/9-4 = 6 // - 6
(-4*a)/9-6-4 = 0
-4/9*a-10 = 0 // + 10
-4/9*a = 10 // : -4/9
a = 10/(-4/9)
a = -45/2
a = -45/2
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