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a in (-oo:+oo)
a+5 = 6*a+30 // - 6*a+30
a-(6*a)-30+5 = 0
a-6*a-30+5 = 0
-5*a-25 = 0 // + 25
-5*a = 25 // : -5
a = 25/(-5)
a = -5
a = -5
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