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a in (-oo:+oo)
2*(a-(1/2)) = 99 // - 99
2*(a-(1/2))-99 = 0
2*(a-1/2)-99 = 0
2*(a-1/2)-99 = 0
2*a-100 = 0
2*a-100 = 0
2*a-100 = 0 // + 100
2*a = 100 // : 2
a = 100/2
a = 50
a = 50
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