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a in (-oo:+oo)
53 = 5*a+6*a-2 // - 5*a+6*a-2
2-(5*a)-(6*a)+53 = 0
2-5*a-6*a+53 = 0
55-11*a = 0 // - 55
-11*a = -55 // : -11
a = -55/(-11)
a = 5
a = 5
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