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a in (-oo:+oo)
5*a-4 = a+0 // - a+0
5*a-a-4+0 = 0
5*a-a-4 = 0
4*a-4 = 0 // + 4
4*a = 4 // : 4
a = 4/4
a = 1
a = 1
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