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a in (-oo:+oo)
4-(5*a) = 54 // - 54
4-(5*a)-54 = 0
4-5*a-54 = 0
-5*a-50 = 0 // + 50
-5*a = 50 // : -5
a = 50/(-5)
a = -10
a = -10
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