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a in (-oo:+oo)
a+9 = 6*a-36 // - 6*a-36
a-(6*a)+9+36 = 0
a-6*a+9+36 = 0
45-5*a = 0 // - 45
-5*a = -45 // : -5
a = -45/(-5)
a = 9
a = 9
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