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a in (-oo:+oo)
a-8 = 4-5*a // - 4-5*a
a-(-5*a)-8-4 = 0
a+5*a-8-4 = 0
6*a-12 = 0 // + 12
6*a = 12 // : 6
a = 12/6
a = 2
a = 2
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