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a in (-oo:+oo)
4*a-1/2 = 89/2-a // - 89/2-a
4*a+a-1/2-(89/2) = 0
4*a+a-1/2-89/2 = 0
5*a-45 = 0 // + 45
5*a = 45 // : 5
a = 45/5
a = 9
a = 9
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