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a in (-oo:+oo)
2*a+3/2 = 5 // - 5
2*a+3/2-5 = 0
2*a-7/2 = 0 // + 7/2
2*a = 7/2 // : 2
a = 7/2/2
a = 7/4
a = 7/4
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