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a in (-oo:+oo)
17 = 5*a+6*a+6 // - 5*a+6*a+6
17-(5*a)-(6*a)-6 = 0
17-5*a-6*a-6 = 0
11-11*a = 0 // - 11
-11*a = -11 // : -11
a = -11/(-11)
a = 1
a = 1
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