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a in (-oo:+oo)
-58 = 8-5*a-(6*a) // - 8-5*a-(6*a)
6*a-(-5*a)-58-8 = 0
5*a+6*a-58-8 = 0
11*a-66 = 0 // + 66
11*a = 66 // : 11
a = 66/11
a = 6
a = 6
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