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a in (-oo:+oo)
0.5*a-(3/2) = -1/4 // + -1/4
0.5*a-(3/2)-(-1/4) = 0
0.5*a-3/2+1/4 = 0
0.5*a-5/4 = 0 // + 5/4
0.5*a = 5/4 // : 0.5
a = 5/4/0.5
a = 2.5
a = 2.5
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