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a in (-oo:+oo)
2*a+(1/3)*a-2 = 5/4 // - 5/4
2*a+(1/3)*a-(5/4)-2 = 0
2*a+(1/3)*a-5/4-2 = 0
7/3*a-13/4 = 0 // + 13/4
7/3*a = 13/4 // : 7/3
a = 13/4/7/3
a = 39/28
a = 39/28
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