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a in (-oo:+oo)
63 = 2*a+3*a+8 // - 2*a+3*a+8
63-(2*a)-(3*a)-8 = 0
63-2*a-3*a-8 = 0
55-5*a = 0 // - 55
-5*a = -55 // : -5
a = -55/(-5)
a = 11
a = 11
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