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a in (-oo:+oo)
a+6 = 3*a+22 // - 3*a+22
a-(3*a)-22+6 = 0
a-3*a-22+6 = 0
-2*a-16 = 0 // + 16
-2*a = 16 // : -2
a = 16/(-2)
a = -8
a = -8
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