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a in (-oo:+oo)
a-9 = 7*a+33 // - 7*a+33
a-(7*a)-33-9 = 0
a-7*a-33-9 = 0
-6*a-42 = 0 // + 42
-6*a = 42 // : -6
a = 42/(-6)
a = -7
a = -7
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