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a in (-oo:+oo)
a-((2*a)/3) = 5/4 // - 5/4
a-((2*a)/3)-(5/4) = 0
a+(-2/3)*a-5/4 = 0
1/3*a-5/4 = 0 // + 5/4
1/3*a = 5/4 // : 1/3
a = 5/4/1/3
a = 15/4
a = 15/4
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