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a in (-oo:+oo)
a+5 = 6*a+50 // - 6*a+50
a-(6*a)-50+5 = 0
a-6*a-50+5 = 0
-5*a-45 = 0 // + 45
-5*a = 45 // : -5
a = 45/(-5)
a = -9
a = -9
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