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