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a in (-oo:+oo)
2*a+(13/4)*a+5/8 = 17/2 // - 17/2
2*a+(13/4)*a+5/8-(17/2) = 0
2*a+(13/4)*a+5/8-17/2 = 0
21/4*a-63/8 = 0 // + 63/8
21/4*a = 63/8 // : 21/4
a = 63/8/21/4
a = 3/2
a = 3/2
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