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a in (-oo:+oo)
5-4*a = 5*a-58 // - 5*a-58
5-4*a-(5*a)+58 = 0
5-4*a-5*a+58 = 0
63-9*a = 0 // - 63
-9*a = -63 // : -9
a = -63/(-9)
a = 7
a = 7
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