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a in (-oo:+oo)
a/4-((2*a)/3) = -5/2 // + -5/2
a/4-((2*a)/3)-(-5/2) = 0
a/4+(-2/3)*a+5/2 = 0
5/2-5/12*a = 0 // - 5/2
-5/12*a = -5/2 // : -5/12
a = -5/2/(-5/12)
a = 6
a = 6
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