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a in (-oo:+oo)
133 = 5*a+6*a+1 // - 5*a+6*a+1
133-(5*a)-(6*a)-1 = 0
133-5*a-6*a-1 = 0
132-11*a = 0 // - 132
-11*a = -132 // : -11
a = -132/(-11)
a = 12
a = 12
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