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a in (-oo:+oo)
4*a-1/2 = 87/2 // - 87/2
4*a-1/2-(87/2) = 0
4*a-1/2-87/2 = 0
4*a-44 = 0 // + 44
4*a = 44 // : 4
a = 44/4
a = 11
a = 11
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