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a in (-oo:+oo)
5*a+1/2 = 89/18 // - 89/18
5*a+1/2-(89/18) = 0
5*a+1/2-89/18 = 0
5*a-40/9 = 0 // + 40/9
5*a = 40/9 // : 5
a = 40/9/5
a = 8/9
a = 8/9
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