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a in (-oo:+oo)
2*a-(7/2) = 3 // - 3
2*a-(7/2)-3 = 0
2*a-7/2-3 = 0
2*a-13/2 = 0 // + 13/2
2*a = 13/2 // : 2
a = 13/2/2
a = 13/4
a = 13/4
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