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a in (-oo:+oo)
5-5*a = 3*a-59 // - 3*a-59
5-5*a-(3*a)+59 = 0
5-5*a-3*a+59 = 0
64-8*a = 0 // - 64
-8*a = -64 // : -8
a = -64/(-8)
a = 8
a = 8
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