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a in (-oo:+oo)
a/4-3 = (2*a)/3 // - (2*a)/3
a/4-((2*a)/3)-3 = 0
a/4+(-2/3)*a-3 = 0
-5/12*a-3 = 0 // + 3
-5/12*a = 3 // : -5/12
a = 3/(-5/12)
a = -36/5
a = -36/5
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